2026-07-20 11:54:36 +03:30
28 changed files with 1461 additions and 477 deletions
--- a/.cursor/rules/appointments.mdc
+++ b/.cursor/rules/appointments.mdc
@@ -0,0 +1,12 @@
+---
+description: Clinic appointments — delete/patient locks when treatment linked
+globs: frontend/src/components/ui/appointments/**,frontend/src/components/appointments/**,backend/src/modules/appointments/**
+alwaysApply: false
+---
+
+# Appointments
+
+- List includes `hasTreatment` when a `Treatment` row is linked (`appointmentId`).
+- **Patient change** blocked while linked → `APPOINTMENT_PATIENT_LOCKED` (UI: `patientLockedHint`).
+- **Delete** blocked while linked → `APPOINTMENT_HAS_TREATMENT` (hide delete + `deleteBlockedHint`). Empty appointments (no treatment yet) remain deletable.
+- Prisma: `Treatment.appointmentId` is `onDelete: SetNull` — deleting an appointment does **not** cascade-delete treatments/cases/tasks; do not rely on cascade for cleanup.
--- a/.cursor/rules/treatment-workspace.mdc
+++ b/.cursor/rules/treatment-workspace.mdc
@@ -1,40 +1,22 @@
 ---
-
 description: Treatment workspace — preview vs form, history, load flow, lab dispatch
-
 globs: frontend/src/components/ui/treatment/**,frontend/src/components/treatment/**,frontend/src/components/shared/treatmentSelection.ts,frontend/src/components/shared/scrollWithinMain.ts,backend/src/modules/treatments/**
-
 alwaysApply: false
-
 ---

-
-
 # Treatment workspace

-
-
 - **Browse mode** (`selectedPreviewId` set): preview only; banner + **Load into workspace**; form unchanged until load.
-
 - **Current draft** preview: heading “Current draft”; no load button while editing live.
-
+- **Entry wizard:** Teeth → Content → Lab via `WizardStepper` (not detail chips). Lab step only for lab-dependent (prosthesis) active detail. Appointment purpose does not gate type or Next.
+- **Tooth groups:** Shift+same-arch range = connected; click in connected span → collapse to that single only. `toothSelectionGroups.ts`; prune lab `toothProsthesis` on change.
+- **Detail chrome:** chips + Add at top; **Remove** = trash on chip (unsent, >1 detail; disabled when day-locked / no edit / uploading). No delete in Content step.
 - **Lab dispatch attention:** `LabDispatchAttentionPanel` — unsent lab-dependent details; quick jump to dispatch.
-
 - **History API:** patient-scoped; non-owners filtered by provider on treatment or appointment; org owners see all.
-
- **History filters (client-side):** `PastTreatmentsPanel` — “Not shipped to lab” + single date; helpers in `treatmentHistoryFilters.ts`. No new fetch params.
-
- **Lab shipment block:** prosthesis/lab-dependent detail with no teeth saves but cannot ship — `LabShipmentBlockedNotice`, inline banner, toast on add shipment.
-
- **Lab case comments:** `DetailLabCaseCommentsSection` under detail when sent and lab tasks not all complete (`taskProgress` from API).
-
- **Today checkbox:** unchecked when viewing a non-today day; checking Today unlocks selection and auto-picks nearest appointment.
-
- **Lab search:** `LinkedOrganizationSearchCombobox` — select from results; invite lab via `/organizations?action=invite-lab` when permitted.
-
- **Scroll:** use `scrollWithinMainScrollContainer`; shared `Checkbox` only.
-
-
+- **History filters (client-side):** `PastTreatmentsPanel` — “Not shipped to lab” + single date; helpers in `treatmentHistoryFilters.ts`.
+- **Lab shipment block:** lab-dependent detail with no teeth saves but cannot ship — `LabShipmentBlockedNotice`, inline banner, toast on add shipment.
+- **Edit gating:** `canEditTreatmentForDay` = permission + appointment + not past day + `live` mode. Sent detail locks that line; Add still OK same day. Upload rejects sent (`TREATMENT_DETAIL_SENT`).
+- **Lab search:** `LinkedOrganizationSearchCombobox`; invite lab via `/organizations?action=invite-lab` when permitted.
+- **Scroll:** `scrollWithinMainScrollContainer`; shared `Checkbox` only.

 Full map: `.cursor/skills/treatment-workspace/SKILL.md`
-
--- a/.cursor/skills/treatment-workspace/SKILL.md
+++ b/.cursor/skills/treatment-workspace/SKILL.md
@@ -2,7 +2,7 @@

 name: dyolink-treatment-workspace

-description: Treatment tab workspace — appointments strip, preview vs form, history, load flow, draft autosave, lab dispatch. Use when changing treatment UX, preview/history, or lab dispatch in TreatmentWorkspace.
+description: Treatment tab workspace — appointments strip, preview vs form, history, load flow, draft autosave, entry wizard, connected teeth, lab dispatch. Use when changing treatment UX, preview/history, or lab dispatch in TreatmentWorkspace.

 ---

@@ -28,7 +28,37 @@ Thin route: `app/[locale]/(dashboard)/treatment/page.tsx` (supports `?appointmen

 3. **Treatment history** — `PastTreatmentsPanel.tsx` (past saved plans for patient; **client-side** filters in `treatmentHistoryFilters.ts`)

-4. **Editor** — `TreatmentDetailsEditor.tsx`, `FdiToothChart.tsx`, `LabCasesDispatchPanel.tsx`
+4. **Editor** — detail chips + Add (`TreatmentDetailsEditor` chrome); entry wizard (`WizardStepper`); step panels: `FdiToothChart`, Content fields, `LabCasesDispatchPanel`
+
+
+
+## Entry wizard (Teeth / Content / Lab)
+
+
+
+Right-column entry uses `WizardStepper` (`components/ui/shared/WizardStepper.tsx`) — numbered nodes + connector rail. **Do not** reuse detail-chip tab styling for steps.
+
+| Step | UI | Notes |
+|------|-----|--------|
+| **Teeth** | `FdiToothChart` | Shift+click range; connected dots |
+| **Content** | `TreatmentDetailsEditor` fields only (`showChrome={false}`) | Type / notes / attachments — **no delete button** |
+| **Lab** | `LabCasesDispatchPanel` | Shown in stepper **only** when active detail type is lab-dependent (`labDependentCodes`) |
+
+- Detail type may differ from appointment purpose (purpose only defaults new details).
+- Next/Back navigate visible steps; leaving prosthesis while on Lab returns to Content.
+
+
+
+## Tooth selection groups
+
+
+
+Helpers: `frontend/src/components/treatment/toothSelectionGroups.ts`. Persisted as `toothSelectionGroups` on the detail; lab tasks group by `selectionGroupId`.
+
+- **Plain click:** add/remove single; if tooth is in a **connected** group → drop the whole span and keep **only** that tooth as a single (no peel / no connected+single pair for the same span).
+- **Shift+click:** inclusive same-arch range between prior anchor and target; replaces overlapping groups. Prevent browser selection artifacts (`select-none`, Shift `preventDefault` on mousedown).
+- On group change, prune/remap `labCase.toothProsthesis` via `pruneToothProsthesisForGroups`.
+- Connected UI label: `ConnectedSelectionBadge` (shared `Badge` + primary tint) in dispatch + lab case lists.



@@ -161,17 +191,27 @@ Draft writes require provider match (`ensureAppointmentProvider`) unless org own

 ## Edit gating

-
-
 ```typescript
-
 canEditTreatmentForDay = canEdit && selectedAppointment && !isViewingPastDay && workspaceMode === 'live'
-
 ```

+Past day or `historical` workspace mode freezes the treatment form + most lab-dispatch fields.

+### Per-detail sent lock
+
+`isDetailLocked` = linked lab case has `sentAt`. Locked details: type, comment, teeth, attachments are read-only (UI + draft save skips updates/deletes; attachment upload returns `TREATMENT_DETAIL_SENT`).
+
+### Add / remove details
+
+- **Add detail** stays enabled whenever `canEditTreatmentForDay` — even if sibling details are already sent.
+- **Remove detail:** trash icon on each **detail chip** in chrome (`TreatmentDetailsEditor` `showChrome`). Same gates as before: only when `details.length > 1`; disabled when `!canEdit`, day/workspace `disabled`, detail sent (`isDetailLocked`), or `uploadBusy`. Confirm via `confirmRemoveDetail`. Drop linked unsent lab drafts with the detail. **Do not** put a delete control in the Content wizard step.
+
+### Sent lab shipment fields (vs detail)
+
+After send, destination / prosthesis / shipment attachments are frozen. **Due date** stays editable until all lab tasks complete (UI still respects day/mode `disabled`). **Comments** stay editable until tasks complete and intentionally ignore the day/mode gate.
+
+Full map helpers: `treatmentDetailRules.ts`, `LabCasesDispatchPanel.tsx`.

-## Optional fields



--- a/AGENTS.md
+++ b/AGENTS.md
@@ -42,13 +42,22 @@ frontend/src/

 **Treatment tab:** Preview and editable form are **separate** until the user clicks **Load into workspace** on a history item. See `.cursor/skills/treatment-workspace/SKILL.md` before changing that flow.

+**Treatment edit / details (quick ref):**
+- Day/mode gate: editable only for live draft on today/future (`canEditTreatmentForDay`). Past day / historical load → read-only form.
+- Sent-to-lab detail locks that line; **Add detail** still OK same day; **Remove detail** = trash icon on each detail chip (not in the wizard Content step) — only unsent and not the last line. Attachment upload blocked when sent (`TREATMENT_DETAIL_SENT`).
+- **Entry wizard:** `WizardStepper` — Teeth → Content → Lab; Lab step only when active detail type is lab-dependent (prosthesis). Detail chips ≠ wizard chrome (chips stay bordered tabs; stepper is numbered rail).
+- **Tooth selection:** Shift+click same-arch range = connected group; plain click on a connected tooth collapses the whole span to that single tooth (no peel). Helpers: `toothSelectionGroups.ts`. Connected label: `ConnectedSelectionBadge` (shared `Badge` + primary tint).
+
 **Treatment lab rules (quick ref):**
 - Lab-dependent details (e.g. prosthesis) **without teeth** can save but **cannot ship** — show `LabShipmentBlockedNotice` + inline banner; toast on dispatch add.
+- Detail treatment type need **not** match appointment purpose — purpose only pre-fills new details.
 - **History filters** are client-side only (`treatmentHistoryFilters.ts`): “Not shipped to lab” + single date on already-fetched patient history; includes live current draft when filtering.
 - **Lab shipments rail**: unified list with scope toggle **This patient** vs **All updates** (unread across org for **this clinician's cases only**, includes patient name).
 - **Unread semantics**: Treatment tab badge = count of unread cases **for the user's own treatment plans** (per-case read cursor) and clears when a case is opened/marked read (not on tab visit).
 - **Lab shipment progress + comments**: shown in **Lab dispatch panel** for the active shipment; expanding activity / opening comments marks that case read.

+**Appointments (quick ref):** Do not delete (or change patient) when `hasTreatment`; codes `APPOINTMENT_HAS_TREATMENT` / `APPOINTMENT_PATIENT_LOCKED`. Appointment delete does not cascade-delete treatments. See `.cursor/rules/appointments.mdc`.
+
 **Lab Tasks tab:** Newest case first; steps ordered 1→N; case grouping when sorted by date; `stepCompleted` filter; prosthesis colors from catalog; task assignment in **Cases** (compact row: status + assignee + last update); on **Tasks**, all staff see every task but only assignee (or unassigned pool) can change status — others see “Assigned to {name}” instead of the status dropdown; **case due dates** set/edited in clinic Treatment lab dispatch, shown on lab Cases/Tasks with overdue filter + sort; **mobile:** larger task status controls, sticky case header when grouped; **tab badges:** `LabCaseActivity` + `GET /notifications/tab-counts` (lab Cases/Tasks split, clinic Treatment) — see `.cursor/skills/lab-tasks/SKILL.md` and `.cursor/skills/lab-notifications/SKILL.md`.

 **Lab Cases tab:** Filter by **prosthesis type** (not treatment type); auto-select newest case on open; list cards use `LabCaseProsthesisGroupsList` (colored type + teeth, shared with Treatment rail). Deep link: `?caseId=`, `?clinicOrganizationId=`. **Share link:** QR + URL on sent cases (attachment left, QR right); opens `/lab-case/[token]` focus page. See `.cursor/skills/lab-cases/SKILL.md` and `.cursor/skills/lab-case-share-link/SKILL.md`.
@@ -82,7 +91,7 @@ Errors: `AppException` + `ErrorCode` → frontend `getUserFacingError()`. Never
 | Skill | When to use |
 |-------|-------------|
 | `.cursor/skills/add-feature/` | New tab, API module, or end-to-end feature |
-| `.cursor/skills/treatment-workspace/` | Treatment tab: preview vs form, history, load flow, drafts |
+| `.cursor/skills/treatment-workspace/` | Treatment tab: preview vs form, history, load flow, drafts, entry wizard, connected teeth |
 | `.cursor/skills/lab-tasks/` | Lab Tasks tab: sort, case grouping, step-completed filter, prosthesis colors |
 | `.cursor/skills/lab-cases/` | Lab Cases tab: prosthesis filter, auto-select, list cards, assignment |
 | `.cursor/skills/lab-case-share-link/` | Case QR share link: access token, focus page, auth redirect, access rules |
--- a/backend/prisma/migrations/20260716120000_tooth_selection_groups/migration.sql
+++ b/backend/prisma/migrations/20260716120000_tooth_selection_groups/migration.sql
@@ -0,0 +1,14 @@
+-- AlterTable
+ALTER TABLE "treatment_details" ADD COLUMN "toothSelectionGroups" JSONB;
+
+-- AlterTable
+ALTER TABLE "lab_case_tooth_prosthesis" ADD COLUMN "selectionGroupId" TEXT NOT NULL DEFAULT '';
+
+-- AlterTable
+ALTER TABLE "lab_case_tasks" ADD COLUMN "selectionGroupId" TEXT NOT NULL DEFAULT '';
+
+-- DropIndex
+DROP INDEX IF EXISTS "lab_case_tasks_labCaseId_treatmentDetailId_prosthesisTypeCode_stepOrder_key";
+
+-- CreateIndex
+CREATE UNIQUE INDEX "lab_case_tasks_labCaseId_treatmentDetailId_selectionGroupId_prosthesisTypeCode_stepOrder_key" ON "lab_case_tasks"("labCaseId", "treatmentDetailId", "selectionGroupId", "prosthesisTypeCode", "stepOrder");
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -176,6 +176,8 @@ model TreatmentDetail {
  sortOrder     Int
  treatmentType String
  teeth         Json
+  /** Selection groups: connected spans + singles. Shape: { groupId, kind, teeth[] }[] */
+  toothSelectionGroups Json?
  comment       String?

  treatment   Treatment                   @relation(fields: [treatmentId], references: [id], onDelete: Cascade)
@@ -340,6 +342,8 @@ model LabCaseToothProsthesis {
  treatmentDetailId  String
  tooth              String
  prosthesisTypeCode String
+  /** Links to TreatmentDetail.toothSelectionGroups[].groupId for task grouping. */
+  selectionGroupId   String @default("")

  labCase LabCase         @relation(fields: [labCaseId], references: [id], onDelete: Cascade)
  detail  TreatmentDetail @relation(fields: [treatmentDetailId], references: [id], onDelete: Cascade)
@@ -355,6 +359,8 @@ model LabCaseTask {
  teeth              Json
  treatmentType      String
  prosthesisTypeCode String
+  /** Empty string for legacy tasks; otherwise matches selection group id. */
+  selectionGroupId   String        @default("")
  workflowStepCode   String
  stepOrder          Int
  stepLabel          String
@@ -373,7 +379,7 @@ model LabCaseTask {
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

-  @@unique([labCaseId, treatmentDetailId, prosthesisTypeCode, stepOrder])
+  @@unique([labCaseId, treatmentDetailId, selectionGroupId, prosthesisTypeCode, stepOrder])
  @@index([labCaseId, status])
  @@index([assigneeUserId])
  @@map("lab_case_tasks")
--- a/backend/src/modules/cases/cases.service.ts
+++ b/backend/src/modules/cases/cases.service.ts
@@ -660,24 +660,44 @@ export class CasesService {
  }

  private buildProsthesisGroupsFromTasks(
-    tasks: Array<{ prosthesisTypeCode: string; teeth: Prisma.JsonValue }>,
-  ): Array<{ prosthesisTypeCode: string; teeth: string[] }> {
-    const prosthesisByCode = new Map<string, string[]>();
+    tasks: Array<{
+      prosthesisTypeCode: string;
+      teeth: Prisma.JsonValue;
+      selectionGroupId?: string;
+    }>,
+  ): Array<{
+    prosthesisTypeCode: string;
+    teeth: string[];
+    connected?: boolean;
+    selectionGroupId?: string;
+  }> {
+    const prosthesisByGroup = new Map<
+      string,
+      { prosthesisTypeCode: string; teeth: string[]; selectionGroupId: string }
+    >();

    for (const task of tasks) {
      if (!task.prosthesisTypeCode) continue;
+      const selectionGroupId = task.selectionGroupId ?? '';
+      const key = `${selectionGroupId}::${task.prosthesisTypeCode}`;
      const teeth = normalizeTaskTeeth(task.teeth);
-      const list = prosthesisByCode.get(task.prosthesisTypeCode) ?? [];
-      list.push(...teeth);
-      prosthesisByCode.set(task.prosthesisTypeCode, list);
+      const entry = prosthesisByGroup.get(key) ?? {
+        prosthesisTypeCode: task.prosthesisTypeCode,
+        teeth: [],
+        selectionGroupId,
+      };
+      entry.teeth.push(...teeth);
+      prosthesisByGroup.set(key, entry);
    }

-    return [...prosthesisByCode.entries()]
-      .map(([prosthesisTypeCode, teeth]) => ({
-        prosthesisTypeCode,
-        teeth: [...new Set(teeth)].sort((a, b) =>
+    return [...prosthesisByGroup.values()]
+      .map((group) => ({
+        prosthesisTypeCode: group.prosthesisTypeCode,
+        teeth: [...new Set(group.teeth)].sort((a, b) =>
          a.localeCompare(b, undefined, { numeric: true }),
        ),
+        selectionGroupId: group.selectionGroupId || undefined,
+        connected: Boolean(group.selectionGroupId) && [...new Set(group.teeth)].length > 1,
      }))
      .sort((a, b) => a.prosthesisTypeCode.localeCompare(b.prosthesisTypeCode));
  }
@@ -694,12 +714,14 @@ export class CasesService {
        treatmentType: string;
        prosthesisTypeCode: string;
        prosthesisTypeLabel: string;
+        selectionGroupId: string;
        tasks: ReturnType<CasesService['mapTask']>[];
      }
    >();

    for (const task of tasks) {
-      const key = `${task.treatmentDetailId}:${task.prosthesisTypeCode}`;
+      const selectionGroupId = task.selectionGroupId ?? '';
+      const key = `${task.treatmentDetailId}:${selectionGroupId}:${task.prosthesisTypeCode}`;
      const entry = groups.get(key) ?? {
        treatmentDetailId: task.treatmentDetailId,
        teeth: normalizeTaskTeeth(task.teeth),
@@ -707,6 +729,7 @@ export class CasesService {
        prosthesisTypeCode: task.prosthesisTypeCode,
        prosthesisTypeLabel:
          prosthesisLabels.get(task.prosthesisTypeCode) ?? task.prosthesisTypeCode,
+        selectionGroupId,
        tasks: [],
      };
      entry.tasks.push(this.mapTask(task, prosthesisLabels));
--- a/backend/src/modules/cases/lab-case-access.service.ts
+++ b/backend/src/modules/cases/lab-case-access.service.ts
@@ -293,24 +293,41 @@ export class LabCaseAccessService {
  ) {
    const tasks = await this.prisma.labCaseTask.findMany({
      where: { labCaseId },
-      select: { prosthesisTypeCode: true, teeth: true },
+      select: { prosthesisTypeCode: true, teeth: true, selectionGroupId: true },
      orderBy: [{ prosthesisTypeCode: 'asc' }],
    });

-    const byCode = new Map<string, string[]>();
+    const byGroup = new Map<
+      string,
+      { prosthesisTypeCode: string; teeth: string[]; selectionGroupId: string }
+    >();
    for (const task of tasks) {
      if (!task.prosthesisTypeCode) continue;
+      const selectionGroupId = task.selectionGroupId ?? '';
+      const key = `${selectionGroupId}::${task.prosthesisTypeCode}`;
      const teeth = normalizeTaskTeeth(task.teeth);
-      const list = byCode.get(task.prosthesisTypeCode) ?? [];
-      list.push(...teeth);
-      byCode.set(task.prosthesisTypeCode, list);
+      const entry = byGroup.get(key) ?? {
+        prosthesisTypeCode: task.prosthesisTypeCode,
+        teeth: [],
+        selectionGroupId,
+      };
+      entry.teeth.push(...teeth);
+      byGroup.set(key, entry);
    }

-    return [...byCode.entries()].map(([prosthesisTypeCode, teeth]) => ({
-      prosthesisTypeCode,
-      prosthesisTypeLabel: prosthesisLabels.get(prosthesisTypeCode) ?? prosthesisTypeCode,
-      teeth: [...new Set(teeth)].sort((a, b) => a.localeCompare(b, undefined, { numeric: true })),
-    }));
+    return [...byGroup.values()].map((group) => {
+      const teeth = [...new Set(group.teeth)].sort((a, b) =>
+        a.localeCompare(b, undefined, { numeric: true }),
+      );
+      return {
+        prosthesisTypeCode: group.prosthesisTypeCode,
+        prosthesisTypeLabel:
+          prosthesisLabels.get(group.prosthesisTypeCode) ?? group.prosthesisTypeCode,
+        teeth,
+        selectionGroupId: group.selectionGroupId || undefined,
+        connected: Boolean(group.selectionGroupId) && teeth.length > 1,
+      };
+    });
  }

  private async getMembership(userId: string, organizationId: string) {
--- a/backend/src/modules/cases/lab-case-task.generator.spec.ts
+++ b/backend/src/modules/cases/lab-case-task.generator.spec.ts
@@ -11,6 +11,7 @@ function buildMockTx(options: {
    treatmentDetailId: string;
    tooth: string;
    prosthesisTypeCode: string;
+    selectionGroupId?: string;
    treatmentType?: string;
  }>;
  prosthesisTypes: Array<{
@@ -35,9 +36,11 @@ function buildMockTx(options: {
          treatmentDetailId: row.treatmentDetailId,
          tooth: row.tooth,
          prosthesisTypeCode: row.prosthesisTypeCode,
+          selectionGroupId: row.selectionGroupId ?? '',
          detail: {
            id: row.treatmentDetailId,
            treatmentType: row.treatmentType ?? 'prosthesis',
+            toothSelectionGroups: null,
          },
        })),
      ),
@@ -169,6 +172,49 @@ describe('generateLabCaseTasks', () => {
    expect(stepCodes).toContain('printer_resin');
  });

+  it('keeps separate selection groups with the same prosthesis type as separate task sets', async () => {
+    const pfmSteps = stepsFromSeed('pfm_crown');
+    const { tx, created } = buildMockTx({
+      toothProsthesisRows: [
+        {
+          treatmentDetailId: 'detail-1',
+          tooth: '14',
+          prosthesisTypeCode: 'pfm_crown',
+          selectionGroupId: 'connected-1',
+        },
+        {
+          treatmentDetailId: 'detail-1',
+          tooth: '15',
+          prosthesisTypeCode: 'pfm_crown',
+          selectionGroupId: 'connected-1',
+        },
+        {
+          treatmentDetailId: 'detail-1',
+          tooth: '21',
+          prosthesisTypeCode: 'pfm_crown',
+          selectionGroupId: 'single-21',
+        },
+      ],
+      prosthesisTypes: [{ code: 'pfm_crown', steps: pfmSteps }],
+    });
+
+    const count = await generateLabCaseTasks(tx as never, 'lab-case-split', 'en');
+    expect(count).toBe(pfmSteps.length * 2);
+    const rows = created as Array<{
+      teeth: string[];
+      selectionGroupId: string;
+      prosthesisTypeCode: string;
+    }>;
+    const connected = rows.filter((r) => r.selectionGroupId === 'connected-1');
+    const single = rows.filter((r) => r.selectionGroupId === 'single-21');
+    expect(connected).toHaveLength(pfmSteps.length);
+    expect(single).toHaveLength(pfmSteps.length);
+    expect(connected.every((r) => JSON.stringify(r.teeth) === JSON.stringify(['14', '15']))).toBe(
+      true,
+    );
+    expect(single.every((r) => JSON.stringify(r.teeth) === JSON.stringify(['21']))).toBe(true);
+  });
+
  it('skips generation when tasks already exist', async () => {
    const { tx } = buildMockTx({
      existingCount: 3,
--- a/backend/src/modules/cases/lab-case-task.generator.ts
+++ b/backend/src/modules/cases/lab-case-task.generator.ts
@@ -18,7 +18,7 @@ export async function generateLabCaseTasks(
  const toothProsthesisRows = await tx.labCaseToothProsthesis.findMany({
    where: { labCaseId },
    include: {
-      detail: { select: { id: true, treatmentType: true } },
+      detail: { select: { id: true, treatmentType: true, toothSelectionGroups: true } },
    },
  });

@@ -58,19 +58,29 @@ export async function generateLabCaseTasks(

  const stepLabels = await resolveStepLabels(tx, allStepCodes, locale);

-  // Group teeth that share the same (treatment detail + prosthesis type): one task set
-  // per group, with each step covering every tooth in that group.
+  // Group by selection group + prosthesis type so connected spans stay one task set,
+  // and separate singles stay separate even with the same prosthesis type.
  const groups = new Map<
    string,
-    { treatmentDetailId: string; treatmentType: string; prosthesisTypeCode: string; teeth: string[] }
+    {
+      treatmentDetailId: string;
+      treatmentType: string;
+      prosthesisTypeCode: string;
+      selectionGroupId: string;
+      teeth: string[];
+    }
  >();

  for (const row of toothProsthesisRows) {
-    const key = `${row.treatmentDetailId}::${row.prosthesisTypeCode}`;
+    const selectionGroupId =
+      row.selectionGroupId?.trim() ||
+      fallbackGroupIdForTooth(row.detail.toothSelectionGroups, row.tooth, row.prosthesisTypeCode);
+    const key = `${row.treatmentDetailId}::${selectionGroupId}::${row.prosthesisTypeCode}`;
    const group = groups.get(key) ?? {
      treatmentDetailId: row.treatmentDetailId,
      treatmentType: row.detail.treatmentType,
      prosthesisTypeCode: row.prosthesisTypeCode,
+      selectionGroupId,
      teeth: [],
    };
    group.teeth.push(row.tooth);
@@ -94,6 +104,7 @@ export async function generateLabCaseTasks(
        teeth,
        treatmentType: group.treatmentType,
        prosthesisTypeCode: group.prosthesisTypeCode,
+        selectionGroupId: group.selectionGroupId,
        workflowStepCode: step.workflowStepCode,
        stepOrder: step.stepOrder,
        stepLabel: stepLabels.get(step.workflowStepCode) ?? step.workflowStepCode,
@@ -110,6 +121,24 @@ export async function generateLabCaseTasks(
  return taskRows.length;
 }

+function fallbackGroupIdForTooth(
+  toothSelectionGroups: unknown,
+  tooth: string,
+  prosthesisTypeCode: string,
+): string {
+  if (Array.isArray(toothSelectionGroups)) {
+    for (const row of toothSelectionGroups) {
+      if (!row || typeof row !== 'object') continue;
+      const rec = row as { groupId?: unknown; teeth?: unknown };
+      if (typeof rec.groupId !== 'string') continue;
+      if (Array.isArray(rec.teeth) && rec.teeth.includes(tooth)) {
+        return rec.groupId;
+      }
+    }
+  }
+  return `legacy-${prosthesisTypeCode}`;
+}
+
 function sortTeeth(teeth: string[]): string[] {
  return [...new Set(teeth)].sort((a, b) => {
    const na = Number(a);
--- a/backend/src/modules/treatments/dto/treatment.dto.ts
+++ b/backend/src/modules/treatments/dto/treatment.dto.ts
@@ -2,6 +2,7 @@ import {
  ArrayMinSize,
  IsArray,
  IsDateString,
+  IsIn,
  IsOptional,
  IsString,
  IsUUID,
@@ -10,6 +11,19 @@ import {
 } from 'class-validator';
 import { Type } from 'class-transformer';

+export class ToothSelectionGroupDto {
+  @IsString()
+  @MaxLength(64)
+  groupId: string;
+
+  @IsIn(['connected', 'single'])
+  kind: 'connected' | 'single';
+
+  @IsArray()
+  @IsString({ each: true })
+  teeth: string[];
+}
+
 export class SaveTreatmentDetailDto {
  @IsString()
  @MaxLength(64)
@@ -27,6 +41,12 @@ export class SaveTreatmentDetailDto {
  @IsString({ each: true })
  teeth: string[];

+  @IsOptional()
+  @IsArray()
+  @ValidateNested({ each: true })
+  @Type(() => ToothSelectionGroupDto)
+  toothSelectionGroups?: ToothSelectionGroupDto[];
+
  @IsOptional()
  @IsString()
  @MaxLength(5000)
@@ -57,6 +77,11 @@ export class LabCaseToothProsthesisDto {
  @IsString()
  @MaxLength(64)
  prosthesisTypeCode: string;
+
+  @IsOptional()
+  @IsString()
+  @MaxLength(64)
+  selectionGroupId?: string;
 }

 export class SaveLabCaseDto {
--- a/backend/src/modules/treatments/treatment.utils.ts
+++ b/backend/src/modules/treatments/treatment.utils.ts
@@ -20,6 +20,42 @@ export function normalizeTeeth(teeth: unknown): string[] {
  return [...unique].sort();
 }

+export type ToothSelectionGroupNormalized = {
+  groupId: string;
+  kind: 'connected' | 'single';
+  teeth: string[];
+};
+
+export function normalizeToothSelectionGroups(
+  value: unknown,
+  fallbackTeeth: string[] = [],
+): ToothSelectionGroupNormalized[] {
+  if (Array.isArray(value) && value.length > 0) {
+    const out: ToothSelectionGroupNormalized[] = [];
+    for (const row of value) {
+      if (!row || typeof row !== 'object') continue;
+      const rec = row as Record<string, unknown>;
+      const groupId = typeof rec.groupId === 'string' && rec.groupId.trim() ? rec.groupId.trim() : '';
+      if (!groupId) continue;
+      const kind = rec.kind === 'connected' ? 'connected' : 'single';
+      const teeth = normalizeTeeth(rec.teeth);
+      if (teeth.length === 0) continue;
+      out.push({
+        groupId,
+        kind: kind === 'connected' && teeth.length < 2 ? 'single' : kind,
+        teeth,
+      });
+    }
+    if (out.length > 0) return out;
+  }
+
+  return fallbackTeeth.map((tooth, index) => ({
+    groupId: `legacy-${tooth}-${index}`,
+    kind: 'single' as const,
+    teeth: [tooth],
+  }));
+}
+
 export function generateTreatmentTitle(
  cases: { treatmentType: string; teeth: string[] }[],
 ): string {
--- a/backend/src/modules/treatments/treatments.service.ts
+++ b/backend/src/modules/treatments/treatments.service.ts
@@ -30,6 +30,7 @@ import { LabCaseActivityService } from '../notifications/lab-case-activity.servi
 import {
  generateTreatmentTitle,
  normalizeTeeth,
+  normalizeToothSelectionGroups,
 } from './treatment.utils';
 import { assertCompleteToothProsthesisMap } from './lab-case-send.validation';
 import { hasEffectivePermission } from '../../common/membership-permissions';
@@ -51,7 +52,7 @@ const sentLabCaseInclude = {
  details: {
    include: {
      detail: {
-        select: { clientKey: true, treatmentType: true, teeth: true },
+        select: { clientKey: true, treatmentType: true, teeth: true, toothSelectionGroups: true },
      },
    },
  },
@@ -59,9 +60,9 @@ const sentLabCaseInclude = {
    orderBy: [{ sentAt: 'asc' as const }],
    include: { organization: { select: { id: true, name: true } } },
  },
-  tasks: { select: { status: true } },
+  tasks: { select: { status: true, selectionGroupId: true, prosthesisTypeCode: true, teeth: true } },
  toothProsthesis: {
-    select: { tooth: true, prosthesisTypeCode: true },
+    select: { tooth: true, prosthesisTypeCode: true, selectionGroupId: true },
  },
 } satisfies Prisma.LabCaseInclude;

@@ -93,7 +94,13 @@ const treatmentInclude = {
      details: {
        include: {
          detail: {
-            select: { id: true, clientKey: true, treatmentType: true, teeth: true },
+            select: {
+              id: true,
+              clientKey: true,
+              treatmentType: true,
+              teeth: true,
+              toothSelectionGroups: true,
+            },
          },
        },
      },
@@ -283,17 +290,36 @@ export class TreatmentsService {
    const taskProgress = this.mapTaskProgress(lc.tasks);
    const labOrg = lc.sends[lc.sends.length - 1]?.organization ?? null;
    const detailTeeth = detail ? normalizeTeeth(detail.teeth) : [];
+    const selectionGroups = normalizeToothSelectionGroups(
+      detail?.toothSelectionGroups,
+      detailTeeth,
+    );
+    const connectedGroupIds = new Set(
+      selectionGroups.filter((g) => g.kind === 'connected').map((g) => g.groupId),
+    );

-    const prosthesisByCode = new Map<string, string[]>();
+    const prosthesisByGroup = new Map<
+      string,
+      { prosthesisTypeCode: string; teeth: string[]; selectionGroupId: string; connected: boolean }
+    >();
    for (const row of lc.toothProsthesis ?? []) {
-      const list = prosthesisByCode.get(row.prosthesisTypeCode) ?? [];
-      list.push(row.tooth);
-      prosthesisByCode.set(row.prosthesisTypeCode, list);
+      const selectionGroupId = row.selectionGroupId || `legacy-${row.prosthesisTypeCode}`;
+      const key = `${selectionGroupId}::${row.prosthesisTypeCode}`;
+      const entry = prosthesisByGroup.get(key) ?? {
+        prosthesisTypeCode: row.prosthesisTypeCode,
+        teeth: [],
+        selectionGroupId,
+        connected: connectedGroupIds.has(row.selectionGroupId),
+      };
+      entry.teeth.push(row.tooth);
+      prosthesisByGroup.set(key, entry);
    }
-    const prosthesisGroups = [...prosthesisByCode.entries()]
-      .map(([prosthesisTypeCode, teeth]) => ({
-        prosthesisTypeCode,
-        teeth: [...new Set(teeth)].sort(),
+    const prosthesisGroups = [...prosthesisByGroup.values()]
+      .map((group) => ({
+        prosthesisTypeCode: group.prosthesisTypeCode,
+        teeth: [...new Set(group.teeth)].sort(),
+        connected: group.connected,
+        selectionGroupId: group.selectionGroupId,
      }))
      .sort((a, b) => a.prosthesisTypeCode.localeCompare(b.prosthesisTypeCode));

@@ -377,13 +403,21 @@ export class TreatmentsService {
      this.treatmentCatalog.assertKnownTreatmentType(d.treatmentType);
    }

-    const normalizedDetails = dto.details.map((d, index) => ({
-      ...d,
-      sortOrder: index,
-      teeth: normalizeTeeth(d.teeth),
-      comment: d.comment?.trim() || null,
-      attachmentIds: d.attachmentIds ?? [],
-    }));
+    const normalizedDetails = dto.details.map((d, index) => {
+      const teeth = normalizeTeeth(d.teeth);
+      const toothSelectionGroups = normalizeToothSelectionGroups(
+        d.toothSelectionGroups,
+        teeth,
+      );
+      return {
+        ...d,
+        sortOrder: index,
+        teeth,
+        toothSelectionGroups,
+        comment: d.comment?.trim() || null,
+        attachmentIds: d.attachmentIds ?? [],
+      };
+    });

    const title = generateTreatmentTitle(
      normalizedDetails.map((d) => ({ treatmentType: d.treatmentType, teeth: d.teeth })),
@@ -454,6 +488,7 @@ export class TreatmentsService {
                sortOrder: d.sortOrder,
                treatmentType: d.treatmentType,
                teeth: d.teeth,
+                toothSelectionGroups: d.toothSelectionGroups,
                comment: d.comment,
              },
            })
@@ -464,6 +499,7 @@ export class TreatmentsService {
                sortOrder: d.sortOrder,
                treatmentType: d.treatmentType,
                teeth: d.teeth,
+                toothSelectionGroups: d.toothSelectionGroups,
                comment: d.comment,
              },
            });
@@ -642,6 +678,7 @@ export class TreatmentsService {
              treatmentDetailId: tp.treatmentDetailId,
              tooth: tp.tooth,
              prosthesisTypeCode: tp.prosthesisTypeCode,
+              selectionGroupId: tp.selectionGroupId?.trim() || '',
            })),
          });
        }
@@ -1091,6 +1128,7 @@ export class TreatmentsService {
    clientKey?: string | null;
    treatmentType: string;
    teeth: unknown;
+    toothSelectionGroups?: unknown;
    comment?: string | null;
    attachments?: Array<{
      id: string;
@@ -1114,11 +1152,13 @@ export class TreatmentsService {
  }) {
    const labCase = d.labCaseLink?.labCase;
    const taskProgress = this.mapTaskProgress(labCase?.tasks ?? []);
+    const teeth = normalizeTeeth(d.teeth);
    return {
      id: d.id,
      clientId: d.clientKey ?? d.id,
      treatmentType: d.treatmentType,
-      teeth: normalizeTeeth(d.teeth),
+      teeth,
+      toothSelectionGroups: normalizeToothSelectionGroups(d.toothSelectionGroups, teeth),
      notes: d.comment ?? null,
      attachmentMetas: (d.attachments ?? []).map((a) => this.mapAttachment(a)),
      labCaseId: labCase?.id ?? null,
@@ -1143,7 +1183,13 @@ export class TreatmentsService {
    dueDate?: Date | null;
    details?: Array<{
      treatmentDetailId: string;
-      detail?: { id: string; clientKey: string | null; treatmentType: string; teeth: unknown };
+      detail?: {
+        id: string;
+        clientKey: string | null;
+        treatmentType: string;
+        teeth: unknown;
+        toothSelectionGroups?: unknown;
+      };
    }>;
    sends?: Array<{
      organizationId: string;
@@ -1154,6 +1200,7 @@ export class TreatmentsService {
      treatmentDetailId: string;
      tooth: string;
      prosthesisTypeCode: string;
+      selectionGroupId?: string;
    }>;
    attachments?: Array<{
      attachment: {
@@ -1167,6 +1214,9 @@ export class TreatmentsService {
    tasks?: Array<{ id: string; status: LabTaskStatus }>;
  }) {
    const taskProgress = this.mapTaskProgress(lc.tasks ?? []);
+    const detailTeeth = lc.details?.[0]?.detail
+      ? normalizeTeeth(lc.details[0].detail.teeth)
+      : [];
    return {
      id: lc.id,
      clientId: lc.clientKey ?? lc.id,
@@ -1180,13 +1230,18 @@ export class TreatmentsService {
            id: lc.details[0].detail?.id ?? lc.details[0].treatmentDetailId,
            clientId: lc.details[0].detail?.clientKey ?? lc.details[0].treatmentDetailId,
            treatmentType: lc.details[0].detail?.treatmentType ?? '',
-            teeth: lc.details[0].detail ? normalizeTeeth(lc.details[0].detail.teeth) : [],
+            teeth: detailTeeth,
+            toothSelectionGroups: normalizeToothSelectionGroups(
+              lc.details[0].detail?.toothSelectionGroups,
+              detailTeeth,
+            ),
          }
        : null,
      toothProsthesis: (lc.toothProsthesis ?? []).map((tp) => ({
        treatmentDetailId: tp.treatmentDetailId,
        tooth: tp.tooth,
        prosthesisTypeCode: tp.prosthesisTypeCode,
+        selectionGroupId: tp.selectionGroupId ?? '',
      })),
      attachments: (lc.attachments ?? []).map((row) => ({
        id: row.attachment.id,
--- a/frontend/messages/en.json
+++ b/frontend/messages/en.json
@@ -661,6 +661,7 @@
    "detailsSubtitle": "Plan teeth, type, notes, and attachments for each detail line.",
    "addDetail": "Add detail",
    "confirmRemoveDetail": "Remove this treatment detail?",
+    "removeDetailAria": "Remove detail {n}",
    "detailLabel": "Detail {n}",
    "detailSentBadge": "sent",
    "detailLockedInShipment": "This detail was sent to a lab and can no longer be edited.",
@@ -799,8 +800,19 @@
    "noActiveOrgs": "No active linked organizations.",
    "confirmSend": "Confirm send",
    "toothChartTitle": "FDI tooth chart",
+    "entryWizardLabel": "Treatment entry steps",
+    "entryStepTeeth": "Teeth",
+    "entryStepContent": "Content",
+    "entryStepLab": "Lab",
+    "entryStepBack": "Back",
+    "entryStepNext": "Next",
+    "entryStepLabUnavailable": "Lab dispatch is available after you save a lab-dependent detail with teeth selected.",
    "toothChartTitleCompact": "Tooth chart",
-    "toothChartHint": "Tap teeth to multi-select. Applies to the active detail.",
+    "toothChartHint": "Tap teeth to select. Shift-click another tooth in the same arch to select a connected span.",
+    "toothConnectedHint": "Connected selection",
+    "toothConnectedSuffix": " (connected)",
+    "connectedBadge": "Connected",
+    "prosthesisConnectedLabel": "Connected teeth prosthesis type",
    "toothChartWholePlan": "Full View",
    "labShipmentAttachments": "Files for the lab",
    "labShipmentAttachmentsHint": "Select which attachments from this detail are included in this shipment. None are sent by default.",
--- a/frontend/messages/fa.json
+++ b/frontend/messages/fa.json
@@ -662,6 +662,7 @@
    "detailsSubtitle": "دندان‌ها، نوع، یادداشت و پیوست‌ها را برای هر خط جزئیات برنامه‌ریزی کنید.",
    "addDetail": "افزودن جزئیات",
    "confirmRemoveDetail": "این جزئیات درمان حذف شود؟",
+    "removeDetailAria": "حذف جزئیات {n}",
    "detailLabel": "جزئیات {n}",
    "detailSentBadge": "ارسال‌شده",
    "detailLockedInShipment": "این جزئیات به لابراتوار ارسال شده و دیگر قابل ویرایش نیست.",
@@ -801,7 +802,18 @@
    "confirmSend": "تأیید ارسال",
    "toothChartTitle": "نمودار دندان‌ها FDI",
    "toothChartTitleCompact": "نمودار دندان",
-    "toothChartHint": "برای انتخاب چندگانه روی دندان‌ها ضربه بزنید. برای جزئیات فعال اعمال می‌شود.",
+    "toothChartHint": "برای انتخاب روی دندان ضربه بزنید. Shift+کلیک روی دندان دیگر در همان قوس، یک بازه متصل می‌سازد.",
+    "toothConnectedHint": "انتخاب متصل",
+    "toothConnectedSuffix": " (متصل)",
+    "connectedBadge": "متصل",
+    "prosthesisConnectedLabel": "نوع پروتز دندان‌های متصل",
+    "entryWizardLabel": "مراحل ثبت درمان",
+    "entryStepTeeth": "دندان‌ها",
+    "entryStepContent": "محتوا",
+    "entryStepLab": "لابراتوار",
+    "entryStepBack": "قبلی",
+    "entryStepNext": "بعدی",
+    "entryStepLabUnavailable": "ارسال به لابراتوار پس از ذخیره جزئیات وابسته به لاب با انتخاب دندان در دسترس است.",
    "toothChartWholePlan": "نمایش کامل",
    "labShipmentAttachments": "فایل‌ها برای لابراتوار",
    "labShipmentAttachmentsHint": "انتخاب کنید کدام پیوست‌های این جزئیات در این محموله ارسال شوند. پیش‌فرض هیچ‌کدام نیست.",
--- a/frontend/messages/nl.json
+++ b/frontend/messages/nl.json
@@ -661,6 +661,7 @@
    "detailsSubtitle": "Plan tanden, type, notities en bijlagen per detailregel.",
    "addDetail": "Detail toevoegen",
    "confirmRemoveDetail": "Dit behandelingsdetail verwijderen?",
+    "removeDetailAria": "Detail {n} verwijderen",
    "detailLabel": "Detail {n}",
    "detailSentBadge": "verzonden",
    "detailLockedInShipment": "Dit detail is naar het lab verzonden en kan niet meer worden bewerkt.",
@@ -800,7 +801,18 @@
    "confirmSend": "Bevestig verzending",
    "toothChartTitle": "FDI-tanddiagram",
    "toothChartTitleCompact": "Tanddiagram",
-    "toothChartHint": "Tik op tanden om meerdere te selecteren. Geldt voor het actieve detail.",
+    "toothChartHint": "Tik op tanden om te selecteren. Shift-klik op een andere tand in dezelfde boog voor een verbonden span.",
+    "toothConnectedHint": "Verbonden selectie",
+    "toothConnectedSuffix": " (verbonden)",
+    "connectedBadge": "Verbonden",
+    "prosthesisConnectedLabel": "Prothesetype voor verbonden tanden",
+    "entryWizardLabel": "Behandeling invoerstappen",
+    "entryStepTeeth": "Tanden",
+    "entryStepContent": "Inhoud",
+    "entryStepLab": "Lab",
+    "entryStepBack": "Terug",
+    "entryStepNext": "Volgende",
+    "entryStepLabUnavailable": "Labverzending is beschikbaar nadat u een lab-afhankelijk detail met geselecteerde tanden hebt opgeslagen.",
    "toothChartWholePlan": "Volledig overzicht",
    "labShipmentAttachments": "Bestanden voor het lab",
    "labShipmentAttachmentsHint": "Kies welke bijlagen van dit detail bij deze zending horen. Standaard worden er geen meegestuurd.",
--- a/frontend/src/components/treatment/toothSelectionGroups.ts
+++ b/frontend/src/components/treatment/toothSelectionGroups.ts
@@ -0,0 +1,189 @@
+import type { FdiToothId } from '@/types/treatment';
+import { FDI_LOWER_LEFT_TO_RIGHT, FDI_UPPER_LEFT_TO_RIGHT } from '@/components/treatment/fdiToothMeta';
+
+export type ToothSelectionKind = 'connected' | 'single';
+
+export type ToothSelectionGroup = {
+  groupId: string;
+  kind: ToothSelectionKind;
+  teeth: FdiToothId[];
+};
+
+function newGroupId(): string {
+  return typeof crypto !== 'undefined' && 'randomUUID' in crypto
+    ? crypto.randomUUID()
+    : `tg-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`;
+}
+
+export function deriveTeethFromGroups(groups: ToothSelectionGroup[]): FdiToothId[] {
+  const set = new Set<FdiToothId>();
+  for (const group of groups) {
+    for (const tooth of group.teeth) set.add(tooth);
+  }
+  return [...set].sort() as FdiToothId[];
+}
+
+/** Legacy / empty groups: each selected tooth becomes its own single group. */
+export function groupsFromFlatTeeth(
+  teeth: readonly FdiToothId[],
+  existing?: ToothSelectionGroup[] | null,
+): ToothSelectionGroup[] {
+  if (existing && existing.length > 0) {
+    const flat = new Set(teeth);
+    const next = existing
+      .map((g) => ({
+        ...g,
+        teeth: g.teeth.filter((t) => flat.has(t)) as FdiToothId[],
+      }))
+      .filter((g) => g.teeth.length > 0)
+      .map((g) =>
+        g.kind === 'connected' && g.teeth.length < 2
+          ? { ...g, kind: 'single' as const }
+          : g,
+      );
+    const covered = new Set(next.flatMap((g) => g.teeth));
+    for (const tooth of teeth) {
+      if (!covered.has(tooth)) {
+        next.push({ groupId: newGroupId(), kind: 'single', teeth: [tooth] });
+      }
+    }
+    return next;
+  }
+  return teeth.map((tooth) => ({
+    groupId: newGroupId(),
+    kind: 'single' as const,
+    teeth: [tooth],
+  }));
+}
+
+export function connectedTeethSet(groups: ToothSelectionGroup[]): Set<FdiToothId> {
+  const set = new Set<FdiToothId>();
+  for (const group of groups) {
+    if (group.kind !== 'connected') continue;
+    for (const tooth of group.teeth) set.add(tooth);
+  }
+  return set;
+}
+
+function archOrder(tooth: FdiToothId): FdiToothId[] | null {
+  if ((FDI_UPPER_LEFT_TO_RIGHT as readonly string[]).includes(tooth)) {
+    return FDI_UPPER_LEFT_TO_RIGHT;
+  }
+  if ((FDI_LOWER_LEFT_TO_RIGHT as readonly string[]).includes(tooth)) {
+    return FDI_LOWER_LEFT_TO_RIGHT;
+  }
+  return null;
+}
+
+export function sameArch(a: FdiToothId, b: FdiToothId): boolean {
+  const archA = archOrder(a);
+  const archB = archOrder(b);
+  return Boolean(archA && archB && archA === archB);
+}
+
+export function teethBetweenInclusive(a: FdiToothId, b: FdiToothId): FdiToothId[] | null {
+  const arch = archOrder(a);
+  if (!arch || !sameArch(a, b)) return null;
+  const i = arch.indexOf(a);
+  const j = arch.indexOf(b);
+  if (i < 0 || j < 0) return null;
+  const [from, to] = i <= j ? [i, j] : [j, i];
+  return arch.slice(from, to + 1);
+}
+
+/**
+ * Plain click:
+ * - unselected → add as single
+ * - selected single → remove
+ * - selected in connected → drop the whole connected span and keep only this tooth as a single
+ */
+export function toggleToothInGroups(
+  groups: ToothSelectionGroup[],
+  tooth: FdiToothId,
+): ToothSelectionGroup[] {
+  const owning = groups.find((g) => g.teeth.includes(tooth));
+  if (!owning) {
+    return [...groups, { groupId: newGroupId(), kind: 'single', teeth: [tooth] }];
+  }
+
+  if (owning.kind === 'single') {
+    return groups.filter((g) => g.groupId !== owning.groupId);
+  }
+
+  // Collapse connected span: only the clicked tooth remains, as a separate single.
+  const next = groups.filter((g) => g.groupId !== owning.groupId);
+  next.push({ groupId: newGroupId(), kind: 'single', teeth: [tooth] });
+  return next;
+}
+
+/**
+ * Shift-click creates a connected span between anchor and target on the same arch.
+ * Any existing groups that intersect the span are replaced by the new connected group.
+ */
+export function applyShiftRange(
+  groups: ToothSelectionGroup[],
+  anchor: FdiToothId,
+  target: FdiToothId,
+): ToothSelectionGroup[] | null {
+  if (anchor === target) return null;
+  const span = teethBetweenInclusive(anchor, target);
+  if (!span || span.length < 2) return null;
+
+  const spanSet = new Set(span);
+  const next = groups
+    .map((g) => ({
+      ...g,
+      teeth: g.teeth.filter((t) => !spanSet.has(t)) as FdiToothId[],
+    }))
+    .filter((g) => g.teeth.length > 0)
+    .map((g) =>
+      g.kind === 'connected' && g.teeth.length < 2
+        ? { ...g, kind: 'single' as const }
+        : g,
+    );
+
+  next.push({ groupId: newGroupId(), kind: 'connected', teeth: span });
+  return next;
+}
+
+/**
+ * Drop prosthesis rows for teeth no longer selected on a detail, and refresh
+ * selectionGroupId so connected→single collapses do not leave stale group ids.
+ */
+export function pruneToothProsthesisForGroups<
+  T extends { detailClientId: string; tooth: string; selectionGroupId?: string },
+>(toothProsthesis: T[], detailClientId: string, groups: ToothSelectionGroup[]): T[] {
+  const toothToGroup = new Map<string, ToothSelectionGroup>();
+  for (const group of groups) {
+    for (const tooth of group.teeth) toothToGroup.set(tooth, group);
+  }
+  return toothProsthesis
+    .filter((tp) => tp.detailClientId !== detailClientId || toothToGroup.has(tp.tooth))
+    .map((tp) => {
+      if (tp.detailClientId !== detailClientId) return tp;
+      const group = toothToGroup.get(tp.tooth);
+      if (!group) return tp;
+      return { ...tp, selectionGroupId: group.groupId };
+    });
+}
+
+export function normalizeToothSelectionGroups(value: unknown): ToothSelectionGroup[] {
+  if (!Array.isArray(value)) return [];
+  const out: ToothSelectionGroup[] = [];
+  for (const row of value) {
+    if (!row || typeof row !== 'object') continue;
+    const rec = row as Record<string, unknown>;
+    const groupId = typeof rec.groupId === 'string' ? rec.groupId : newGroupId();
+    const kind = rec.kind === 'connected' ? 'connected' : 'single';
+    const teeth = Array.isArray(rec.teeth)
+      ? (rec.teeth.filter((t) => typeof t === 'string') as FdiToothId[])
+      : [];
+    if (teeth.length === 0) continue;
+    out.push({
+      groupId,
+      kind: kind === 'connected' && teeth.length < 2 ? 'single' : kind,
+      teeth,
+    });
+  }
+  return out;
+}
--- a/frontend/src/components/ui/lab/LabCaseProsthesisGroupsList.tsx
+++ b/frontend/src/components/ui/lab/LabCaseProsthesisGroupsList.tsx
@@ -1,5 +1,6 @@
 'use client';

+import { ConnectedSelectionBadge } from '@/components/ui/treatment/ConnectedSelectionBadge';
 import {
  formatToothList,
  prosthesisTypeColorFromCatalog,
@@ -9,6 +10,8 @@ import type { ProsthesisCatalogEntry } from '@/types/treatment-catalog';
 export type LabCaseProsthesisGroup = {
  prosthesisTypeCode: string;
  teeth: string[];
+  connected?: boolean;
+  selectionGroupId?: string;
 };

 interface LabCaseProsthesisGroupsListProps {
@@ -31,12 +34,15 @@ export function LabCaseProsthesisGroupsList({
      <ul className="space-y-0.5">
        {groups.map((group) => (
          <li
-            key={group.prosthesisTypeCode}
+            key={`${group.selectionGroupId ?? ''}-${group.prosthesisTypeCode}-${group.teeth.join(',')}`}
            className="text-[11px] leading-snug"
            style={{
              color: prosthesisTypeColorFromCatalog(group.prosthesisTypeCode, prosthesisCatalog),
            }}
          >
+            {group.connected ? (
+              <ConnectedSelectionBadge className="me-1 align-middle text-[9px] px-1 py-px" />
+            ) : null}
            <span className="font-medium">
              {prosthesisLabel(group.prosthesisTypeCode, prosthesisCatalog)}
            </span>
--- a/frontend/src/components/ui/shared/WizardStepper.tsx
+++ b/frontend/src/components/ui/shared/WizardStepper.tsx
@@ -0,0 +1,100 @@
+'use client';
+
+export type WizardStepItem = {
+  id: string;
+  label: string;
+};
+
+type WizardStepperProps = {
+  steps: WizardStepItem[];
+  currentStepId: string;
+  onStepChange: (stepId: string) => void;
+  /** Accessible name for the stepper. */
+  'aria-label': string;
+  className?: string;
+};
+
+/**
+ * Compact horizontal progress stepper — numbered nodes + connector rail.
+ * Distinct from chip/tab row patterns used elsewhere (e.g. treatment detail chips).
+ */
+export function WizardStepper({
+  steps,
+  currentStepId,
+  onStepChange,
+  'aria-label': ariaLabel,
+  className,
+}: WizardStepperProps) {
+  const currentIndex = Math.max(
+    0,
+    steps.findIndex((step) => step.id === currentStepId),
+  );
+
+  return (
+    <nav aria-label={ariaLabel} className={className}>
+      <ol className="flex items-center gap-0 min-w-0">
+        {steps.map((step, index) => {
+          const isCurrent = index === currentIndex;
+          const isComplete = index < currentIndex;
+          const isUpcoming = index > currentIndex;
+
+          return (
+            <li key={step.id} className="flex items-center min-w-0 flex-1 last:flex-none">
+              <button
+                type="button"
+                aria-current={isCurrent ? 'step' : undefined}
+                onClick={() => onStepChange(step.id)}
+                className={`
+                  group inline-flex items-center gap-1.5 shrink-0 rounded-[var(--radius-sm)]
+                  py-0.5 pe-1 ps-0.5 transition-colors
+                  focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/45
+                  ${isUpcoming ? 'opacity-70 hover:opacity-100' : ''}
+                `}
+              >
+                <span
+                  className={`
+                    inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-full
+                    text-[10px] font-semibold leading-none tabular-nums transition-colors
+                    ${
+                      isCurrent
+                        ? 'bg-primary text-primary-contrast shadow-[0_0_0_2px_var(--color-primary-soft)]'
+                        : isComplete
+                          ? 'bg-primary-soft text-primary'
+                          : 'bg-background-secondary text-text-muted ring-1 ring-inset ring-border'
+                    }
+                  `}
+                >
+                  {index + 1}
+                </span>
+                <span
+                  className={`
+                    text-[11px] leading-none whitespace-nowrap transition-colors
+                    ${
+                      isCurrent
+                        ? 'font-semibold text-text-primary'
+                        : isComplete
+                          ? 'font-medium text-text-secondary'
+                          : 'font-medium text-text-muted'
+                    }
+                  `}
+                >
+                  {step.label}
+                </span>
+              </button>
+
+              {index < steps.length - 1 ? (
+                <span
+                  aria-hidden
+                  className={`
+                    mx-1.5 h-px min-w-[0.75rem] flex-1 rounded-full
+                    ${isComplete ? 'bg-primary/55' : 'bg-border'}
+                  `}
+                />
+              ) : null}
+            </li>
+          );
+        })}
+      </ol>
+    </nav>
+  );
+}
--- a/frontend/src/components/ui/treatment/ConnectedSelectionBadge.tsx
+++ b/frontend/src/components/ui/treatment/ConnectedSelectionBadge.tsx
@@ -0,0 +1,29 @@
+'use client';
+
+import { useTranslations } from 'next-intl';
+import { Badge } from '@/components/ui/shared/Badge';
+
+/** Primary-tint styling matching the previous custom connected pill. */
+const CONNECTED_BADGE_STYLE = {
+  backgroundColor: 'color-mix(in srgb, var(--color-primary) 10%, transparent)',
+  color: 'var(--color-primary)',
+  borderColor: 'color-mix(in srgb, var(--color-primary) 40%, transparent)',
+} as const;
+
+type ConnectedSelectionBadgeProps = {
+  className?: string;
+};
+
+/** Compact “Connected” label — shared Badge with primary tint (not default variant colors). */
+export function ConnectedSelectionBadge({ className }: ConnectedSelectionBadgeProps) {
+  const t = useTranslations('treatment');
+  return (
+    <Badge
+      fixedWidth={false}
+      className={`text-[10px] min-h-0 py-0.5 px-1.5 leading-none ${className ?? ''}`}
+      style={CONNECTED_BADGE_STYLE}
+    >
+      {t('connectedBadge')}
+    </Badge>
+  );
+}
--- a/frontend/src/components/ui/treatment/FdiToothChart.tsx
+++ b/frontend/src/components/ui/treatment/FdiToothChart.tsx
@@ -21,7 +21,9 @@ function quadrantMirrored(fdi: FdiToothId): boolean {

 interface FdiToothChartProps {
  selected: ReadonlySet<FdiToothId>;
-  onToggle?: (fdi: FdiToothId) => void;
+  /** Teeth that belong to a connected selection span (dots above/below). */
+  connectedTeeth?: ReadonlySet<FdiToothId>;
+  onToggle?: (fdi: FdiToothId, event: { shiftKey: boolean }) => void;
  disabled?: boolean;
  /** Non-interactive display (Cases / connection history). */
  readOnly?: boolean;
@@ -38,6 +40,7 @@ interface FdiToothChartProps {

 export function FdiToothChart({
  selected,
+  connectedTeeth,
  onToggle,
  disabled,
  readOnly = false,
@@ -147,6 +150,7 @@ export function FdiToothChart({
        const kind = getToothShapeKind(fdi);
        const gid = `${uid}-g-${fdi}-${i}`;
        const isSel = selected.has(fdi);
+        const isConnected = Boolean(connectedTeeth?.has(fdi));
        const size = toothSizeClass(fdi);
        const tweak = TOOTH_TWEAKS[fdi];
        const offsetY = tweak ? tweak.offset : archOffset(i, teeth.length, upper);
@@ -168,24 +172,44 @@ export function FdiToothChart({
          />
        );

+        const connectedDot = isConnected ? (
+          <span
+            className={`block h-1.5 w-1.5 rounded-full bg-primary ${upper ? 'mb-0.5' : 'mt-0.5'}`}
+            aria-hidden
+            title={t('toothConnectedHint')}
+          />
+        ) : (
+          <span className={`block h-1.5 w-1.5 ${upper ? 'mb-0.5' : 'mt-0.5'}`} aria-hidden />
+        );
+
        return (
          <div key={fdi} className={`flex flex-col items-center ${size.wrapper}`}>
+            {upper ? connectedDot : null}
            <div className={`h-[5.9rem] flex ${alignItems} justify-center`}>
              {interactive ? (
                <button
                  type="button"
                  disabled={isDisabled}
-                  onClick={() => onToggle?.(fdi)}
+                  onMouseDown={(e) => {
+                    // Shift+click otherwise triggers browser text-selection / sticky focus boxes.
+                    if (e.shiftKey) e.preventDefault();
+                  }}
+                  onClick={(e) => {
+                    e.preventDefault();
+                    onToggle?.(fdi, { shiftKey: e.shiftKey });
+                  }}
                  style={{ transform: `translateY(${offsetY}px) rotate(${rotate}deg)` }}
                  className={`
-                    rounded-[var(--radius-sm)] p-0.5 transition-transform
+                    rounded-[var(--radius-sm)] p-0.5 transition-transform select-none
                    focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/50
                    ${isDisabled ? 'opacity-50 cursor-not-allowed' : 'hover:scale-105 active:scale-95'}
                  `}
                  aria-pressed={isSel}
                  aria-label={
                    isSel
-                      ? `${t('toothAria', { fdi })}${t('toothSelectedSuffix')}`
+                      ? `${t('toothAria', { fdi })}${t('toothSelectedSuffix')}${
+                          isConnected ? t('toothConnectedSuffix') : ''
+                        }`
                      : t('toothAria', { fdi })
                  }
                >
@@ -201,6 +225,7 @@ export function FdiToothChart({
                </div>
              )}
            </div>
+            {!upper ? connectedDot : null}
          </div>
        );
      })}
@@ -215,8 +240,8 @@ export function FdiToothChart({
    <>
      <p className="text-[11px] uppercase tracking-wide text-text-muted mb-1 text-center">{t('upperArch')}</p>

-      <div className="overflow-x-auto py-1 -mx-1 px-1">
-        <div className="relative isolate min-w-max mx-auto w-fit">
+      <div className="overflow-x-auto py-1 -mx-1 px-1 select-none">
+        <div className="relative isolate min-w-max mx-auto w-fit select-none">
          <div
            className="pointer-events-none absolute left-1/2 top-3 bottom-3 w-px -translate-x-1/2 bg-border/70"
            aria-hidden
--- a/frontend/src/components/ui/treatment/LabCasesDispatchPanel.tsx
+++ b/frontend/src/components/ui/treatment/LabCasesDispatchPanel.tsx
@@ -4,6 +4,7 @@ import { useEffect, useState } from 'react';
 import { useTranslations } from 'next-intl';
 import { Button } from '@/components/ui/shared/Button';
 import { Checkbox } from '@/components/ui/shared/Checkbox';
+import { ConnectedSelectionBadge } from '@/components/ui/treatment/ConnectedSelectionBadge';
 import { isDetailReadyForLabDispatch, isLabCaseCompleted } from '@/components/treatment/treatmentDetailRules';
 import { AppDateInput } from '@/components/ui/shared/AppDateInput';
 import { toDateInputValue } from '@/components/lab/labCaseDueDateDisplay';
@@ -19,6 +20,7 @@ import { prosthesisTypeColorFromCatalog } from '@/components/treatment/prosthesi
 import type { ProsthesisCatalogEntry, TreatmentCatalogEntry } from '@/types/treatment-catalog';
 import type { LabCaseDraft, LinkedOrganizationOption, TreatmentDetailDraft } from '@/types/treatment';
 import type { PatientLabCaseSummary } from '@/types/lab-case-activity';
+import { groupsFromFlatTeeth } from '@/components/treatment/toothSelectionGroups';

 interface LabCasesDispatchPanelProps {
  details: TreatmentDetailDraft[];
@@ -56,32 +58,50 @@ function sentDetailClientIds(labCases: LabCaseDraft[]): Set<string> {
  return ids;
 }

-function prosthesisTeethRows(
+type ProsthesisGroupRow = {
+  groupId: string;
+  kind: 'connected' | 'single';
+  teeth: string[];
+  detailClientId: string;
+  detailNumber: number;
+};
+
+function prosthesisGroupRows(
  labCase: LabCaseDraft,
  activeDetail: TreatmentDetailDraft,
  detailNumber: number,
-): Array<{ detailClientId: string; tooth: string; detailNumber: number }> {
+): ProsthesisGroupRow[] {
  if (labCase.detailClientId !== activeDetail.clientId) return [];
  if (activeDetail.treatmentType !== 'prosthesis') return [];

-  return activeDetail.teeth.map((tooth) => ({
+  const groups =
+    activeDetail.toothSelectionGroups.length > 0
+      ? activeDetail.toothSelectionGroups
+      : groupsFromFlatTeeth(activeDetail.teeth);
+
+  return groups.map((g) => ({
+    groupId: g.groupId,
+    kind: g.kind,
+    teeth: g.teeth,
    detailClientId: activeDetail.clientId,
-    tooth,
    detailNumber,
  }));
 }

 function isProsthesisMapComplete(
  labCase: LabCaseDraft,
-  rows: Array<{ detailClientId: string; tooth: string }>,
+  rows: ProsthesisGroupRow[],
 ): boolean {
  if (rows.length === 0) return true;
  return rows.every((row) =>
-    labCase.toothProsthesis.some(
-      (tp) =>
-        tp.detailClientId === row.detailClientId &&
-        tp.tooth === row.tooth &&
-        Boolean(tp.prosthesisTypeCode),
+    row.teeth.every((tooth) =>
+      labCase.toothProsthesis.some(
+        (tp) =>
+          tp.detailClientId === row.detailClientId &&
+          tp.tooth === tooth &&
+          tp.selectionGroupId === row.groupId &&
+          Boolean(tp.prosthesisTypeCode),
+      ),
    ),
  );
 }
@@ -148,11 +168,12 @@ export function LabCasesDispatchPanel({
    : null;

  const prosthesisRows = activeLabCase && activeDetail
-    ? prosthesisTeethRows(activeLabCase, activeDetail, activeDetailNumber)
+    ? prosthesisGroupRows(activeLabCase, activeDetail, activeDetailNumber)
    : [];
  const prosthesisComplete = activeLabCase
    ? isProsthesisMapComplete(activeLabCase, prosthesisRows)
    : true;
+  const flatToothCount = prosthesisRows.reduce((sum, row) => sum + row.teeth.length, 0);

  useEffect(() => {
    if (!activeLabCase?.destinationOrganizationId) {
@@ -196,28 +217,36 @@ export function LabCasesDispatchPanel({
    );
  }

-  function setToothProsthesis(
-    detailClientId: string,
-    tooth: string,
-    prosthesisTypeCode: string,
-  ) {
+  function setGroupProsthesis(row: ProsthesisGroupRow, prosthesisTypeCode: string) {
    if (!activeLabCase) return;
+    const toothSet = new Set(row.teeth);
    const rest = activeLabCase.toothProsthesis.filter(
-      (tp) => !(tp.detailClientId === detailClientId && tp.tooth === tooth),
+      (tp) => !(tp.detailClientId === row.detailClientId && toothSet.has(tp.tooth)),
    );
    const next = prosthesisTypeCode
-      ? [...rest, { detailClientId, tooth, prosthesisTypeCode }]
+      ? [
+          ...rest,
+          ...row.teeth.map((tooth) => ({
+            detailClientId: row.detailClientId,
+            tooth,
+            prosthesisTypeCode,
+            selectionGroupId: row.groupId,
+          })),
+        ]
      : rest;
    updateActiveLabCase({ toothProsthesis: next });
  }

  function applyProsthesisToAll(code: string) {
    if (!activeLabCase || !code) return;
-    const next = prosthesisRows.map((row) => ({
-      detailClientId: row.detailClientId,
-      tooth: row.tooth,
-      prosthesisTypeCode: code,
-    }));
+    const next = prosthesisRows.flatMap((row) =>
+      row.teeth.map((tooth) => ({
+        detailClientId: row.detailClientId,
+        tooth,
+        prosthesisTypeCode: code,
+        selectionGroupId: row.groupId,
+      })),
+    );
    updateActiveLabCase({ toothProsthesis: next });
  }

@@ -316,49 +345,55 @@ export function LabCasesDispatchPanel({
      );
    }

-    const byType = new Map<string, string[]>();
-    for (const tp of activeLabCase.toothProsthesis) {
-      if (tp.detailClientId !== activeDetail.clientId) continue;
-      if (!tp.prosthesisTypeCode) continue;
-      const list = byType.get(tp.prosthesisTypeCode) ?? [];
-      list.push(tp.tooth);
-      byType.set(tp.prosthesisTypeCode, list);
-    }
+    const selectionGroups =
+      activeDetail.toothSelectionGroups.length > 0
+        ? activeDetail.toothSelectionGroups
+        : groupsFromFlatTeeth(activeDetail.teeth);

-    const uniqueSelected = [...new Set(activeDetail.teeth)];
-    const mappedTeeth = new Set<string>();
-    for (const teeth of byType.values()) {
-      for (const tooth of teeth) mappedTeeth.add(tooth);
-    }
-    const unmapped = uniqueSelected.filter((t) => !mappedTeeth.has(t));
-
-    const groups = [...byType.entries()]
-      .map(([code, teeth]) => ({
+    const rows = selectionGroups.map((group) => {
+      const codes = new Set(
+        activeLabCase.toothProsthesis
+          .filter(
+            (tp) =>
+              tp.detailClientId === activeDetail.clientId &&
+              group.teeth.includes(tp.tooth as never) &&
+              tp.prosthesisTypeCode,
+          )
+          .map((tp) => tp.prosthesisTypeCode),
+      );
+      const code = codes.size === 1 ? [...codes][0] : '';
+      return {
+        groupId: group.groupId,
+        kind: group.kind,
+        teeth: group.teeth,
        code,
-        teeth: [...new Set(teeth)].sort((a, b) => a.localeCompare(b)),
-        label: prosthesisOptions.find((p) => p.code === code)?.label ?? code,
-      }))
-      .sort((a, b) => a.code.localeCompare(b.code));
+        label: code
+          ? prosthesisOptions.find((p) => p.code === code)?.label ?? code
+          : t('prosthesisUnassigned'),
+      };
+    });

    return (
      <div className="text-sm text-text-primary rounded-[var(--radius-sm)] border border-border/50 bg-background-secondary/50 px-3 py-2 space-y-1">
        <p className="text-text-primary">
          {t('detailLabel', { n: activeDetailNumber })} · {typeLabel}
        </p>
-        {groups.map((g) => (
+        {rows.map((g) => (
          <p
-            key={g.code}
+            key={g.groupId}
            className="text-[13px]"
-            style={{ color: prosthesisTypeColorFromCatalog(g.code, prosthesisOptions) }}
+            style={{
+              color: g.code
+                ? prosthesisTypeColorFromCatalog(g.code, prosthesisOptions)
+                : undefined,
+            }}
          >
+            {g.kind === 'connected' ? (
+              <ConnectedSelectionBadge className="me-1 align-middle" />
+            ) : null}
            {g.label}: <span className="text-text-primary">{g.teeth.join(', ')}</span>
          </p>
        ))}
-        {unmapped.length > 0 ? (
-          <p className="text-[13px] text-text-muted">
-            {t('prosthesisUnassigned')}: <span className="text-text-primary">{unmapped.join(', ')}</span>
-          </p>
-        ) : null}
      </div>
    );
  }
@@ -514,75 +549,82 @@ export function LabCasesDispatchPanel({
                  <p className="text-xs font-medium text-text-secondary">
                    {t('prosthesisTypesTitle')}
                  </p>
-                  <label className="block text-xs text-text-muted space-y-1">
-                    {t('prosthesisApplyAll')}
-                    <select
-                      value={applyAllProsthesis}
-                      disabled={disabled || prosthesisOptions.length === 0}
-                      onChange={(e) => {
-                        const code = e.target.value;
-                        setApplyAllProsthesis(code);
-                        if (code) applyProsthesisToAll(code);
-                      }}
-                      className={`${FORM_SELECT_CLASS} w-full mt-1`}
-                    >
-                      <option value="">{t('prosthesisSelectPlaceholder')}</option>
-                      {prosthesisOptions.map((opt) => (
-                        <option key={opt.code} value={opt.code}>
-                          {opt.label}
-                        </option>
-                      ))}
-                    </select>
-                  </label>
-                  <div className="overflow-x-auto overscroll-x-contain">
-                    <table className="w-full text-sm">
-                      <thead>
-                        <tr className="text-left text-xs text-text-muted">
-                          <th className="pb-2 pr-3 font-medium">{t('prosthesisColTooth')}</th>
-                          <th className="pb-2 pr-3 font-medium">{t('prosthesisColDetail')}</th>
-                          <th className="pb-2 font-medium">{t('prosthesisColType')}</th>
-                        </tr>
-                      </thead>
-                      <tbody>
-                        {prosthesisRows.map((row) => {
-                          const current =
-                            activeLabCase.toothProsthesis.find(
-                              (tp) =>
-                                tp.detailClientId === row.detailClientId &&
-                                tp.tooth === row.tooth,
-                            )?.prosthesisTypeCode ?? '';
-                          return (
-                            <tr key={`${row.detailClientId}-${row.tooth}`} className="border-t border-border/40">
-                              <td className="py-2 pr-3 text-text-primary">{row.tooth}</td>
-                              <td className="py-2 pr-3 text-text-secondary">
-                                {t('detailLabel', { n: row.detailNumber })}
-                              </td>
-                              <td className="py-2">
-                                <select
-                                  value={current}
-                                  disabled={disabled}
-                                  onChange={(e) =>
-                                    setToothProsthesis(
-                                      row.detailClientId,
-                                      row.tooth,
-                                      e.target.value,
-                                    )
-                                  }
-                                  className={`${FORM_SELECT_CLASS} w-full min-w-0 sm:min-w-[160px]`}
-                                >
-                                  <option value="">{t('prosthesisSelectPlaceholder')}</option>
-                                  {prosthesisOptions.map((opt) => (
-                                    <option key={opt.code} value={opt.code}>
-                                      {opt.label}
-                                    </option>
-                                  ))}
-                                </select>
-                              </td>
-                            </tr>
-                          );
-                        })}
-                      </tbody>
-                    </table>
+                  {flatToothCount > 1 && prosthesisRows.every((r) => r.kind === 'single') ? (
+                    <label className="block text-xs text-text-muted space-y-1">
+                      {t('prosthesisApplyAll')}
+                      <select
+                        value={applyAllProsthesis}
+                        disabled={disabled || prosthesisOptions.length === 0}
+                        onChange={(e) => {
+                          const code = e.target.value;
+                          setApplyAllProsthesis(code);
+                          if (code) applyProsthesisToAll(code);
+                        }}
+                        className={`${FORM_SELECT_CLASS} w-full mt-1`}
+                      >
+                        <option value="">{t('prosthesisSelectPlaceholder')}</option>
+                        {prosthesisOptions.map((opt) => (
+                          <option key={opt.code} value={opt.code}>
+                            {opt.label}
+                          </option>
+                        ))}
+                      </select>
+                    </label>
+                  ) : null}
+                  <div className="space-y-3">
+                    {prosthesisRows.map((row) => {
+                      const current =
+                        activeLabCase.toothProsthesis.find(
+                          (tp) =>
+                            tp.detailClientId === row.detailClientId &&
+                            tp.selectionGroupId === row.groupId &&
+                            row.teeth.includes(tp.tooth),
+                        )?.prosthesisTypeCode ??
+                        activeLabCase.toothProsthesis.find(
+                          (tp) =>
+                            tp.detailClientId === row.detailClientId &&
+                            row.teeth.includes(tp.tooth),
+                        )?.prosthesisTypeCode ??
+                        '';
+                      return (
+                        <label
+                          key={row.groupId}
+                          className="block text-xs text-text-muted space-y-1 rounded-[var(--radius-sm)] border border-border/50 bg-background-secondary/40 px-3 py-2"
+                        >
+                          <span className="flex flex-wrap items-center gap-2 text-text-secondary">
+                            {row.kind === 'connected' ? <ConnectedSelectionBadge /> : null}
+                            <span>
+                              {row.kind === 'connected'
+                                ? t('prosthesisConnectedLabel')
+                                : t('prosthesisColTooth')}
+                              {': '}
+                              <span className="text-text-primary">{row.teeth.join(', ')}</span>
+                            </span>
+                            <span className="text-text-muted">
+                              · {t('detailLabel', { n: row.detailNumber })}
+                            </span>
+                          </span>
+                          <select
+                            value={current}
+                            disabled={disabled}
+                            onChange={(e) => setGroupProsthesis(row, e.target.value)}
+                            className={`${FORM_SELECT_CLASS} w-full mt-1`}
+                            aria-label={
+                              row.kind === 'connected'
+                                ? t('prosthesisConnectedLabel')
+                                : t('prosthesisColType')
+                            }
+                          >
+                            <option value="">{t('prosthesisSelectPlaceholder')}</option>
+                            {prosthesisOptions.map((opt) => (
+                              <option key={opt.code} value={opt.code}>
+                                {opt.label}
+                              </option>
+                            ))}
+                          </select>
+                        </label>
+                      );
+                    })}
                  </div>
                </div>
              ) : null}
--- a/frontend/src/components/ui/treatment/TreatmentDetailsEditor.tsx
+++ b/frontend/src/components/ui/treatment/TreatmentDetailsEditor.tsx
@@ -2,12 +2,14 @@

 import { useRef } from 'react';
 import { useTranslations } from 'next-intl';
+import { Trash2 } from 'lucide-react';
 import { Button } from '@/components/ui/shared/Button';
 import { Dropdown } from '@/components/ui/shared/Dropdown';
 import {
  autosaveStatusClass,
  labPendingBannerClass,
  labSentBannerClass,
+  labBlockedBannerClass,
 } from '@/components/treatment/treatmentStatusStyles';
 import type { TreatmentDetailDraft } from '@/types/treatment';
 import type { TreatmentCatalogEntry } from '@/types/treatment-catalog';
@@ -17,7 +19,6 @@ import {
  isDetailTypeSelected,
  isLabDependentDetailMissingTeeth,
 } from '@/components/treatment/treatmentDetailRules';
-import { labBlockedBannerClass } from '@/components/treatment/treatmentStatusStyles';

 interface TreatmentDetailsEditorProps {
  details: TreatmentDetailDraft[];
@@ -32,8 +33,12 @@ interface TreatmentDetailsEditorProps {
  saveStatus: 'idle' | 'dirty' | 'saving' | 'saved' | 'error';
  uploadBusy: boolean;
  onAddDetail: () => void;
-  onRemoveDetail: () => void;
+  onRemoveDetail?: (detailClientId: string) => void;
  onUploadFiles: (files: FileList | null) => void;
+  /** Detail chips + Add detail (default true). */
+  showChrome?: boolean;
+  /** Type / notes / attachments fields (default true). */
+  showFields?: boolean;
 }

 export function TreatmentDetailsEditor({
@@ -51,6 +56,8 @@ export function TreatmentDetailsEditor({
  onAddDetail,
  onRemoveDetail,
  onUploadFiles,
+  showChrome = true,
+  showFields = true,
 }: TreatmentDetailsEditorProps) {
  const t = useTranslations('treatment');
  const tCommon = useTranslations('common');
@@ -61,7 +68,6 @@ export function TreatmentDetailsEditor({

  const locked = isDetailLocked(activeDetail);
  const readOnly = disabled || locked;
-  const canRemoveDetail = canEdit && !disabled && !locked && details.length > 1;
  const treatmentTypeTextColor = isDetailTypeSelected(activeDetail)
    ? treatmentTypeColor(
        activeDetail.treatmentType,
@@ -75,159 +81,191 @@ export function TreatmentDetailsEditor({
    labDependentCodes,
  );

+  if (!showChrome && !showFields) return null;
+
  return (
    <div className="surface-card p-3 sm:p-4 space-y-4">
-      <div className="flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-center sm:justify-between">
-        <div>
-          <h3 className="text-sm font-semibold text-text-primary">{t('detailsTitle')}</h3>
-          <p className="text-xs text-text-muted mt-0.5">{t('detailsSubtitle')}</p>
-        </div>
-        <Button
-          type="button"
-          variant="primary"
-          disabled={!canEdit || disabled}
-          onClick={onAddDetail}
-          fullWidth
-          className="sm:w-auto shrink-0"
-        >
-          {t('addDetail')}
-        </Button>
-      </div>
-
-      <div className="flex flex-wrap gap-2">
-        {details.map((d, idx) => (
-          <button
-            key={d.clientId}
-            type="button"
-            onClick={() => onActiveDetailChange(d.clientId)}
-            className={`
-              rounded-[var(--radius-md)] border px-3 py-1.5 text-sm transition-colors
-              focus:outline-none focus-visible:ring-2 focus-visible:ring-primary/45
-              ${
-                d.clientId === activeDetailId
-                  ? 'border-primary bg-primary-soft font-medium text-text-primary'
-                  : 'border-border/70 text-text-secondary hover:border-border hover:bg-background-card/50'
-              }
-            `}
-          >
-            {t('detailLabel', { n: idx + 1 })}
-            {isDetailLocked(d) ? ` · ${t('detailSentBadge')}` : ''}
-          </button>
-        ))}
-      </div>
-
-      <div className="space-y-4 border border-border/60 rounded-[var(--radius-md)] p-4 bg-background-secondary/30">
-        {locked && (
-          <p className={labSentBannerClass}>{t('detailLockedInShipment')}</p>
-        )}
-        {showPendingLabHint && (
-          <p className={labPendingBannerClass}>{t('detailPendingLabSend')}</p>
-        )}
-        {showMissingTeethLabBlock && (
-          <p className={labBlockedBannerClass}>{t('labShipmentBlockedBody')}</p>
-        )}
-
-        <label className="block text-xs font-medium text-text-secondary">
-          {t('comments')}
-          <textarea
-            value={activeDetail.comment}
-            onChange={(e) => {
-              const v = e.target.value;
-              onDetailsChange(
-                details.map((d) => (d.clientId === activeDetailId ? { ...d, comment: v } : d)),
-              );
-            }}
-            placeholder={t('commentsPlaceholder')}
-            rows={5}
-            disabled={readOnly}
-            className="mt-1.5 w-full rounded-[var(--radius-md)] border border-border bg-background-secondary/90 text-text-primary text-sm px-3 py-2 placeholder:text-text-muted focus:outline-none focus:ring-2 focus:ring-primary/35 resize-y min-h-[120px]"
-          />
-        </label>
-
-        <div>
-          <Dropdown
-            label={t('treatmentType')}
-            value={activeDetail.treatmentType}
-            onChange={(e) => {
-              const nextType = e.target.value as TreatmentDetailDraft['treatmentType'];
-              onDetailsChange(
-                details.map((d) =>
-                  d.clientId === activeDetailId ? { ...d, treatmentType: nextType } : d,
-                ),
-              );
-            }}
-            disabled={readOnly}
-            style={{ color: treatmentTypeTextColor }}
-          >
-            <option value="">{t('treatmentTypePlaceholder')}</option>
-            {treatmentCatalog.map((entry, index) => (
-              <option
-                key={entry.code}
-                value={entry.code}
-                style={{
-                  color: treatmentTypeColor(entry.code, index),
-                  backgroundColor: '#14253d',
-                }}
-              >
-                {entry.label}
-              </option>
-            ))}
-          </Dropdown>
-        </div>
-
-        <div>
-          <p className="text-xs font-medium text-text-secondary mb-2">{t('attachments')}</p>
-          <input
-            ref={attachmentInputRef}
-            id="treatment-detail-attachments"
-            type="file"
-            multiple
-            disabled={readOnly || uploadBusy}
-            onChange={(e) => {
-              onUploadFiles(e.target.files);
-              e.target.value = '';
-            }}
-            className="sr-only"
-            aria-label={t('attachFiles')}
-          />
-          <Button
-            type="button"
-            variant="primary"
-            disabled={readOnly || uploadBusy}
-            isLoading={uploadBusy}
-            onClick={() => attachmentInputRef.current?.click()}
-            aria-controls="treatment-detail-attachments"
-          >
-            {t('chooseFiles')}
-          </Button>
-          {activeDetail.attachmentMetas.length > 0 && (
-            <ul className="mt-2 space-y-1 text-xs text-text-muted">
-              {activeDetail.attachmentMetas.map((f) => (
-                <li key={f.id} className="truncate">
-                  {f.fileName} ({(f.sizeBytes / 1024).toFixed(1)} KB)
-                </li>
-              ))}
-            </ul>
-          )}
-        </div>
-
-        {canRemoveDetail ? (
-          <div className="pt-1">
+      {showChrome ? (
+        <>
+          <div className="flex flex-col gap-3 sm:flex-row sm:flex-wrap sm:items-center sm:justify-between">
+            <div>
+              <h3 className="text-sm font-semibold text-text-primary">{t('detailsTitle')}</h3>
+              <p className="text-xs text-text-muted mt-0.5">{t('detailsSubtitle')}</p>
+            </div>
            <Button
              type="button"
-              variant="danger"
-              onClick={onRemoveDetail}
-              disabled={uploadBusy}
+              variant="primary"
+              disabled={!canEdit || disabled}
+              onClick={onAddDetail}
              fullWidth
-              className="sm:w-auto"
+              className="sm:w-auto shrink-0"
            >
-              {tCommon('delete')}
+              {t('addDetail')}
            </Button>
          </div>
-        ) : null}
-      </div>

-      {canEdit && saveStatus !== 'idle' && (
+          <div className="flex flex-wrap gap-2">
+            {details.map((d, idx) => {
+              const detailLocked = isDetailLocked(d);
+              const isActive = d.clientId === activeDetailId;
+              // Same rules as the former Content-step delete button:
+              // only when more than one detail remains; disabled if no edit, day-locked, sent, or uploading.
+              const showRemoveAction = details.length > 1;
+              const removeDisabled =
+                !canEdit || disabled || detailLocked || uploadBusy;
+              return (
+                <div
+                  key={d.clientId}
+                  className={`
+                    inline-flex items-stretch overflow-hidden rounded-[var(--radius-md)] border
+                    ${
+                      isActive
+                        ? 'border-primary bg-primary-soft'
+                        : 'border-border/70 hover:border-border hover:bg-background-card/50'
+                    }
+                  `}
+                >
+                  <button
+                    type="button"
+                    onClick={() => onActiveDetailChange(d.clientId)}
+                    className={`
+                      px-3 py-1.5 text-sm transition-colors
+                      focus:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-primary/45
+                      ${isActive ? 'font-medium text-text-primary' : 'text-text-secondary'}
+                    `}
+                  >
+                    {t('detailLabel', { n: idx + 1 })}
+                    {detailLocked ? ` · ${t('detailSentBadge')}` : ''}
+                  </button>
+                  {showRemoveAction ? (
+                    <button
+                      type="button"
+                      onClick={(e) => {
+                        e.stopPropagation();
+                        if (removeDisabled) return;
+                        onRemoveDetail?.(d.clientId);
+                      }}
+                      disabled={removeDisabled}
+                      title={tCommon('delete')}
+                      aria-label={t('removeDetailAria', { n: idx + 1 })}
+                      className={`
+                        inline-flex items-center justify-center border-s px-1.5 transition-colors
+                        focus:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-red-500/40
+                        disabled:opacity-40 disabled:cursor-not-allowed disabled:hover:bg-transparent disabled:hover:text-inherit
+                        ${
+                          isActive
+                            ? 'border-primary/30 text-text-muted hover:bg-red-500/15 hover:text-red-600'
+                            : 'border-border/60 text-text-muted hover:bg-red-500/15 hover:text-red-600'
+                        }
+                      `}
+                    >
+                      <Trash2 className="h-3.5 w-3.5" aria-hidden />
+                    </button>
+                  ) : null}
+                </div>
+              );
+            })}
+          </div>
+        </>
+      ) : null}
+
+      {showFields ? (
+        <div className="space-y-4 border border-border/60 rounded-[var(--radius-md)] p-4 bg-background-secondary/30">
+          {locked && <p className={labSentBannerClass}>{t('detailLockedInShipment')}</p>}
+          {showPendingLabHint && (
+            <p className={labPendingBannerClass}>{t('detailPendingLabSend')}</p>
+          )}
+          {showMissingTeethLabBlock && (
+            <p className={labBlockedBannerClass}>{t('labShipmentBlockedBody')}</p>
+          )}
+
+          <div>
+            <Dropdown
+              label={t('treatmentType')}
+              value={activeDetail.treatmentType}
+              onChange={(e) => {
+                const nextType = e.target.value as TreatmentDetailDraft['treatmentType'];
+                onDetailsChange(
+                  details.map((d) =>
+                    d.clientId === activeDetailId ? { ...d, treatmentType: nextType } : d,
+                  ),
+                );
+              }}
+              disabled={readOnly}
+              style={{ color: treatmentTypeTextColor }}
+            >
+              <option value="">{t('treatmentTypePlaceholder')}</option>
+              {treatmentCatalog.map((entry, index) => (
+                <option
+                  key={entry.code}
+                  value={entry.code}
+                  style={{
+                    color: treatmentTypeColor(entry.code, index),
+                    backgroundColor: '#14253d',
+                  }}
+                >
+                  {entry.label}
+                </option>
+              ))}
+            </Dropdown>
+          </div>
+
+          <label className="block text-xs font-medium text-text-secondary">
+            {t('comments')}
+            <textarea
+              value={activeDetail.comment}
+              onChange={(e) => {
+                const v = e.target.value;
+                onDetailsChange(
+                  details.map((d) => (d.clientId === activeDetailId ? { ...d, comment: v } : d)),
+                );
+              }}
+              placeholder={t('commentsPlaceholder')}
+              rows={5}
+              disabled={readOnly}
+              className="mt-1.5 w-full rounded-[var(--radius-md)] border border-border bg-background-secondary/90 text-text-primary text-sm px-3 py-2 placeholder:text-text-muted focus:outline-none focus:ring-2 focus:ring-primary/35 resize-y min-h-[120px]"
+            />
+          </label>
+
+          <div>
+            <p className="text-xs font-medium text-text-secondary mb-2">{t('attachments')}</p>
+            <input
+              ref={attachmentInputRef}
+              id="treatment-detail-attachments"
+              type="file"
+              multiple
+              disabled={readOnly || uploadBusy}
+              onChange={(e) => {
+                onUploadFiles(e.target.files);
+                e.target.value = '';
+              }}
+              className="sr-only"
+              aria-label={t('attachFiles')}
+            />
+            <Button
+              type="button"
+              variant="primary"
+              disabled={readOnly || uploadBusy}
+              isLoading={uploadBusy}
+              onClick={() => attachmentInputRef.current?.click()}
+              aria-controls="treatment-detail-attachments"
+            >
+              {t('chooseFiles')}
+            </Button>
+            {activeDetail.attachmentMetas.length > 0 && (
+              <ul className="mt-2 space-y-1 text-xs text-text-muted">
+                {activeDetail.attachmentMetas.map((f) => (
+                  <li key={f.id} className="truncate">
+                    {f.fileName} ({(f.sizeBytes / 1024).toFixed(1)} KB)
+                  </li>
+                ))}
+              </ul>
+            )}
+          </div>
+        </div>
+      ) : null}
+
+      {showFields && canEdit && saveStatus !== 'idle' && (
        <p
          className={`text-xs pt-2 border-t border-border/60 ${autosaveStatusClass(saveStatus)}`}
          role="status"
--- a/frontend/src/components/ui/treatment/TreatmentWorkspace.tsx
+++ b/frontend/src/components/ui/treatment/TreatmentWorkspace.tsx
@@ -5,6 +5,7 @@ import { useLocale, useTranslations } from 'next-intl';
 import { useRouter } from '@/i18n/navigation';
 import { Button } from '@/components/ui/shared/Button';
 import { Checkbox } from '@/components/ui/shared/Checkbox';
+import { WizardStepper } from '@/components/ui/shared/WizardStepper';
 import { PatientSearchCombobox } from '@/components/ui/patient/PatientSearchCombobox';
 import {
  TreatmentLabCasesPanel,
@@ -39,6 +40,14 @@ import {
  isEmptyDraftDetail,
  isLabDependentDetailMissingTeeth,
 } from '@/components/treatment/treatmentDetailRules';
+import {
+  applyShiftRange,
+  connectedTeethSet,
+  deriveTeethFromGroups,
+  groupsFromFlatTeeth,
+  pruneToothProsthesisForGroups,
+  toggleToothInGroups,
+} from '@/components/treatment/toothSelectionGroups';
 import type { LabDispatchAttentionItem } from '@/components/treatment/labDispatchAttention';
 import { collectLabDispatchAttention } from '@/components/treatment/labDispatchAttention';
 import { canEditTreatment, canViewTreatment, canAccessDashboardRoute } from '@/components/shared/permissions';
@@ -68,6 +77,9 @@ import type {
 import type { PatientLabCaseSummary } from '@/types/lab-case-activity';

 type WorkspaceMode = 'live' | 'historical';
+type EntryStep = 'teeth' | 'content' | 'lab';
+
+const ENTRY_STEPS: EntryStep[] = ['teeth', 'content', 'lab'];

 function isTreatmentDayHistorical(treatmentAt: string, todayStart: Date): boolean {
  return compareLocalDayStart(new Date(treatmentAt), todayStart) < 0;
@@ -98,6 +110,7 @@ function labCaseDraftsToPast(
            clientId: linkedDetail.clientId,
            treatmentType: linkedDetail.treatmentType,
            teeth: linkedDetail.teeth,
+            toothSelectionGroups: linkedDetail.toothSelectionGroups,
          }
        : null,
      sends: lc.sends ?? [],
@@ -154,6 +167,7 @@ function newDetail(defaultTreatmentType?: string): TreatmentDetailDraft {
        : `detail-${Date.now()}-${Math.random().toString(36).slice(2, 9)}`,
    treatmentType: defaultTreatmentType ?? '',
    teeth: [],
+    toothSelectionGroups: [],
    comment: '',
    attachmentMetas: [],
    sendToOrganizationIds: [],
@@ -190,11 +204,14 @@ function mapAppointment(record: AppointmentRecord): TreatmentAppointment {
 }

 function mapDetailFromApi(d: PastTreatmentCase): TreatmentDetailDraft {
+  const teeth = d.teeth;
+  const toothSelectionGroups = groupsFromFlatTeeth(teeth, d.toothSelectionGroups ?? null);
  return {
    clientId: d.clientId,
    id: d.id,
    treatmentType: d.treatmentType,
-    teeth: d.teeth,
+    teeth,
+    toothSelectionGroups,
    comment: d.notes ?? '',
    attachmentMetas: d.attachmentMetas ?? [],
    labCaseId: d.labCaseId ?? null,
@@ -215,6 +232,7 @@ function mapLabCaseDraftFromApi(lc: PastLabCase): LabCaseDraft {
      detailClientId: lc.detail?.clientId ?? tp.treatmentDetailId,
      tooth: tp.tooth,
      prosthesisTypeCode: tp.prosthesisTypeCode,
+      selectionGroupId: tp.selectionGroupId ?? '',
    })),
    attachmentIds: (lc.attachments ?? []).map((a) => a.id),
    sentAt: lc.sentAt ?? null,
@@ -231,6 +249,7 @@ function serializeDetails(details: TreatmentDetailDraft[]) {
      id: d.id,
      treatmentType: d.treatmentType,
      teeth: d.teeth,
+      toothSelectionGroups: d.toothSelectionGroups,
      comment: d.comment,
      attachmentMetas: d.attachmentMetas,
    })),
@@ -261,6 +280,7 @@ function detailsToPreviewTreatment(
      clientId: d.clientId,
      treatmentType: d.treatmentType,
      teeth: d.teeth,
+      toothSelectionGroups: d.toothSelectionGroups,
      notes: d.comment || null,
      attachmentMetas: d.attachmentMetas,
      labCaseId: d.labCaseId ?? null,
@@ -380,6 +400,7 @@ export function TreatmentWorkspace({
  const [organizationSearch, setOrganizationSearch] = useState('');
  const [recentOrganizationIds, setRecentOrganizationIds] = useState<string[]>([]);
  const [showWholeTreatmentPlan, setShowWholeTreatmentPlan] = useState(false);
+  const [entryStep, setEntryStep] = useState<EntryStep>('teeth');

  const isDetailLocked = useCallback(
    (detail: TreatmentDetailDraft) =>
@@ -478,6 +499,20 @@ export function TreatmentWorkspace({
    [details, labDependentCodes],
  );

+  /** Lab wizard step only for prosthesis (lab-dependent) treatment types on the active detail. */
+  const showLabWizardStep = useMemo(
+    () => Boolean(activeDetail && labDependentCodes.has(activeDetail.treatmentType)),
+    [activeDetail, labDependentCodes],
+  );
+
+  const visibleEntrySteps = useMemo(
+    () =>
+      showLabWizardStep
+        ? ENTRY_STEPS
+        : (ENTRY_STEPS.filter((step) => step !== 'lab') as EntryStep[]),
+    [showLabWizardStep],
+  );
+
  const showLabShipmentBlocked = useMemo(
    () =>
      Boolean(
@@ -546,6 +581,11 @@ export function TreatmentWorkspace({
  }, []);

  const selectedTeethSet = useMemo(() => new Set(activeDetail?.teeth ?? []), [activeDetail?.teeth]);
+  const connectedSelectedTeeth = useMemo(
+    () => connectedTeethSet(activeDetail?.toothSelectionGroups ?? []),
+    [activeDetail?.toothSelectionGroups],
+  );
+  const rangeAnchorRef = useRef<FdiToothId | null>(null);

  const wholePlanTeethSet = useMemo(() => {
    const set = new Set<FdiToothId>();
@@ -574,8 +614,17 @@ export function TreatmentWorkspace({
  // Reset whole-plan overview when switching details.
  useEffect(() => {
    setShowWholeTreatmentPlan(false);
+    rangeAnchorRef.current = null;
+    setEntryStep('teeth');
  }, [activeDetailId]);

+  // Leave Lab step if the active detail is no longer prosthesis / lab-dependent.
+  useEffect(() => {
+    if (entryStep === 'lab' && !showLabWizardStep) {
+      setEntryStep('content');
+    }
+  }, [entryStep, showLabWizardStep]);
+
  // Sync active lab shipment when the selected treatment detail changes.
  useEffect(() => {
    const match = labCaseDrafts.find((lc) => lc.detailClientId === activeDetailId);
@@ -864,14 +913,17 @@ export function TreatmentWorkspace({
      }

      const response = await treatmentsApi.saveDraft(selectedAppointment.id, {
-        details: currentDetails.map(({ clientId, id, treatmentType, teeth, comment, attachmentMetas }) => ({
-          clientId,
-          id,
-          treatmentType,
-          teeth,
-          comment,
-          attachmentIds: attachmentMetas.map((a) => a.id),
-        })),
+        details: currentDetails.map(
+          ({ clientId, id, treatmentType, teeth, toothSelectionGroups, comment, attachmentMetas }) => ({
+            clientId,
+            id,
+            treatmentType,
+            teeth,
+            toothSelectionGroups,
+            comment,
+            attachmentIds: attachmentMetas.map((a) => a.id),
+          }),
+        ),
      });
      const mapped = response.data.details.map(mapDetailFromApi);
      setDetails(mapped);
@@ -1081,6 +1133,7 @@ export function TreatmentWorkspace({
          setActiveLabCaseId(linked.clientId);
        }
        if (options?.scrollToLabPanel !== false) {
+          setEntryStep('lab');
          requestAnimationFrame(() => {
            scrollWithinMainScrollContainer(labPanelRef.current);
          });
@@ -1140,6 +1193,7 @@ export function TreatmentWorkspace({
        if (linked) {
          setActiveLabCaseId(linked.clientId);
        }
+        setEntryStep('lab');
        requestAnimationFrame(() => {
          scrollWithinMainScrollContainer(labPanelRef.current);
        });
@@ -1306,11 +1360,18 @@ export function TreatmentWorkspace({
                  treatmentDetailId: detailId,
                  tooth: tp.tooth,
                  prosthesisTypeCode: tp.prosthesisTypeCode,
+                  selectionGroupId: tp.selectionGroupId ?? '',
                };
              })
              .filter(
-                (row): row is { treatmentDetailId: string; tooth: string; prosthesisTypeCode: string } =>
-                  row !== null,
+                (
+                  row,
+                ): row is {
+                  treatmentDetailId: string;
+                  tooth: string;
+                  prosthesisTypeCode: string;
+                  selectionGroupId: string;
+                } => row !== null,
              ),
            attachmentIds: lc.attachmentIds,
            dueDate: lc.dueDate ?? null,
@@ -1379,35 +1440,42 @@ export function TreatmentWorkspace({
    ],
  );

-  const handleRemoveActiveDetail = useCallback(() => {
-    if (!canEditTreatmentForDay) return;
-    const idx = details.findIndex((d) => d.clientId === activeDetailId);
-    if (idx < 0) return;
-    const active = details[idx];
-    if (!active || isDetailLocked(active) || details.length <= 1) return;
-    if (!window.confirm(t('confirmRemoveDetail'))) return;
+  const handleRemoveDetail = useCallback(
+    (detailClientId: string) => {
+      if (!canEditTreatmentForDay) return;
+      const idx = details.findIndex((d) => d.clientId === detailClientId);
+      if (idx < 0) return;
+      const target = details[idx];
+      if (!target || isDetailLocked(target) || details.length <= 1) return;
+      if (!window.confirm(t('confirmRemoveDetail'))) return;

-    const removedId = active.clientId;
-    const nextDetails = details.filter((d) => d.clientId !== removedId);
-    const nextActive =
-      nextDetails[Math.min(idx, nextDetails.length - 1)]?.clientId ?? nextDetails[0]?.clientId;
-    setDetails(nextDetails);
-    if (nextActive) setActiveDetailId(nextActive);
+      const nextDetails = details.filter((d) => d.clientId !== detailClientId);
+      const nextActive =
+        activeDetailId === detailClientId
+          ? (nextDetails[Math.min(idx, nextDetails.length - 1)]?.clientId ??
+            nextDetails[0]?.clientId)
+          : activeDetailId;
+      setDetails(nextDetails);
+      if (nextActive) setActiveDetailId(nextActive);

-    if (labCaseDrafts.some((lc) => lc.detailClientId === removedId)) {
-      handleLabCasesChange(
-        withoutEmptyLabCaseDrafts(labCaseDrafts.filter((lc) => lc.detailClientId !== removedId)),
-      );
-    }
-  }, [
-    activeDetailId,
-    canEditTreatmentForDay,
-    details,
-    handleLabCasesChange,
-    isDetailLocked,
-    labCaseDrafts,
-    t,
-  ]);
+      if (labCaseDrafts.some((lc) => lc.detailClientId === detailClientId)) {
+        handleLabCasesChange(
+          withoutEmptyLabCaseDrafts(
+            labCaseDrafts.filter((lc) => lc.detailClientId !== detailClientId),
+          ),
+        );
+      }
+    },
+    [
+      activeDetailId,
+      canEditTreatmentForDay,
+      details,
+      handleLabCasesChange,
+      isDetailLocked,
+      labCaseDrafts,
+      t,
+    ],
+  );

  const handleAddLabCase = useCallback(async () => {
    if (!canEditTreatmentForDay || !selectedAppointment) return;
@@ -1764,35 +1832,6 @@ export function TreatmentWorkspace({
        </div>

        <div className="space-y-3 min-w-0 w-full">
-          <FdiToothChart
-            selected={chartSelectedTeeth}
-            toothColors={chartToothColors}
-            readOnly={showWholeTreatmentPlan}
-            headerControl={
-              details.length > 1 ? (
-                <Checkbox
-                  checked={showWholeTreatmentPlan}
-                  onChange={setShowWholeTreatmentPlan}
-                  label={t('toothChartWholePlan')}
-                  className="text-[11px] [&_span:last-child]:text-[11px] [&_span:last-child]:text-text-muted"
-                />
-              ) : undefined
-            }
-            onToggle={(fdi) => {
-              if (!canEditTreatmentForDay || isDetailLocked(activeDetail) || showWholeTreatmentPlan) return;
-              setDetails((prev) =>
-                prev.map((d) => {
-                  if (d.clientId !== activeDetailId) return d;
-                  const set = new Set(d.teeth);
-                  if (set.has(fdi)) set.delete(fdi);
-                  else set.add(fdi);
-                  return { ...d, teeth: [...set].sort() as FdiToothId[] };
-                }),
-              );
-            }}
-            disabled={!canEditTreatmentForDay || isDetailLocked(activeDetail)}
-          />
-
          <TreatmentDetailsEditor
            details={details}
            activeDetailId={activeDetailId}
@@ -1811,60 +1850,223 @@ export function TreatmentWorkspace({
              );
              setDetails((prev) => [...prev, next]);
              setActiveDetailId(next.clientId);
+              setEntryStep('teeth');
            }}
-            onRemoveDetail={handleRemoveActiveDetail}
+            onRemoveDetail={handleRemoveDetail}
            onUploadFiles={(files) => void uploadForDetail(activeDetailId, files ?? [])}
+            showChrome
+            showFields={false}
          />

-          <div ref={labPanelRef}>
-          {showLabShipmentBlocked ? <LabShipmentBlockedNotice /> : null}
-          {showLabDispatchPanel ? (
-          <LabCasesDispatchPanel
-            details={details}
-            activeDetailId={activeDetailId}
-            labCases={labCaseDrafts}
-            labDependentCodes={labDependentCodes}
-            treatmentCatalog={treatmentCatalog}
-            labCaseSummary={activeLabCaseSummary}
-            locale={locale}
-            onLabCaseSummaryChange={handleLabCaseSummaryChange}
-            onLabCaseMarkedRead={handleLabCaseMarkedRead}
-            onLabCaseActivityChange={() => {
-              if (historyPatientId) {
-                void refreshPatientLabCases(historyPatientId, { silent: true });
-              }
-            }}
-            activeLabCaseId={activeLabCaseId}
-            onLabCasesChange={handleLabCasesChange}
-            disabled={!canEditTreatmentForDay}
-            canEdit={canEdit}
-            orgs={orgs}
-            organizationSearch={organizationSearch}
-            onOrganizationSearchChange={setOrganizationSearch}
-            recentOrganizationIds={recentOrganizationIds}
-            onRecentOrganizationPick={(orgId) => {
-              setLabCaseDrafts((prev) => {
-                const targetId =
-                  activeLabCaseId ??
-                  prev.find((lc) => !lc.sentAt && lc.detailClientId === activeDetailId)
-                    ?.clientId;
-                if (!targetId) return prev;
-                return prev.map((lc) =>
-                  lc.clientId === targetId && !lc.sentAt
-                    ? { ...lc, destinationOrganizationId: orgId }
-                    : lc,
-                );
-              });
-            }}
-            sendBusyId={sendBusyId}
-            onAddLabCase={() => void handleAddLabCase()}
-            onSendLabCase={(lc, comment) => void handleSendLabCase(lc, comment)}
-            onCommentError={showError}
-            canInviteLab={canAccessOrganizations}
-            onInviteLab={() => router.push('/organizations?action=invite-lab')}
-          />
-          ) : null}
+          <div className="surface-card px-3 py-2 flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between sm:gap-3">
+            <WizardStepper
+              className="min-w-0 flex-1"
+              aria-label={t('entryWizardLabel')}
+              steps={visibleEntrySteps.map((step) => ({
+                id: step,
+                label:
+                  step === 'teeth'
+                    ? t('entryStepTeeth')
+                    : step === 'content'
+                      ? t('entryStepContent')
+                      : t('entryStepLab'),
+              }))}
+              currentStepId={entryStep}
+              onStepChange={(stepId) => setEntryStep(stepId as EntryStep)}
+            />
+            <div className="flex flex-wrap gap-2 sm:justify-end shrink-0">
+              <Button
+                type="button"
+                variant="ghost"
+                disabled={entryStep === 'teeth'}
+                onClick={() => {
+                  const idx = visibleEntrySteps.indexOf(entryStep);
+                  if (idx > 0) setEntryStep(visibleEntrySteps[idx - 1]);
+                }}
+              >
+                {t('entryStepBack')}
+              </Button>
+              <Button
+                type="button"
+                variant="primary"
+                disabled={
+                  entryStep === 'lab' || (entryStep === 'content' && !showLabWizardStep)
+                }
+                onClick={() => {
+                  if (entryStep === 'teeth') setEntryStep('content');
+                  else if (entryStep === 'content' && showLabWizardStep) setEntryStep('lab');
+                }}
+              >
+                {t('entryStepNext')}
+              </Button>
+            </div>
          </div>
+
+          {entryStep === 'teeth' ? (
+            <FdiToothChart
+              selected={chartSelectedTeeth}
+              connectedTeeth={showWholeTreatmentPlan ? undefined : connectedSelectedTeeth}
+              toothColors={chartToothColors}
+              readOnly={showWholeTreatmentPlan}
+              headerControl={
+                details.length > 1 ? (
+                  <Checkbox
+                    checked={showWholeTreatmentPlan}
+                    onChange={setShowWholeTreatmentPlan}
+                    label={t('toothChartWholePlan')}
+                    className="text-[11px] [&_span:last-child]:text-[11px] [&_span:last-child]:text-text-muted"
+                  />
+                ) : undefined
+              }
+              onToggle={(fdi, event) => {
+                if (
+                  !canEditTreatmentForDay ||
+                  isDetailLocked(activeDetail) ||
+                  showWholeTreatmentPlan ||
+                  !activeDetailId
+                ) {
+                  return;
+                }
+
+                const detail = details.find((d) => d.clientId === activeDetailId);
+                if (!detail) return;
+                const currentGroups =
+                  detail.toothSelectionGroups.length > 0
+                    ? detail.toothSelectionGroups
+                    : groupsFromFlatTeeth(detail.teeth);
+
+                let nextGroups: ReturnType<typeof toggleToothInGroups> | null = null;
+
+                if (event.shiftKey) {
+                  const anchor = rangeAnchorRef.current;
+                  // Need a prior click as range start; shift alone on one tooth does nothing.
+                  if (!anchor || anchor === fdi) {
+                    rangeAnchorRef.current = fdi;
+                    return;
+                  }
+                  nextGroups = applyShiftRange(currentGroups, anchor, fdi);
+                  rangeAnchorRef.current = fdi;
+                  if (!nextGroups) return;
+                } else {
+                  nextGroups = toggleToothInGroups(currentGroups, fdi);
+                  rangeAnchorRef.current = fdi;
+                }
+
+                setDetails((prev) =>
+                  prev.map((d) =>
+                    d.clientId !== activeDetailId
+                      ? d
+                      : {
+                          ...d,
+                          toothSelectionGroups: nextGroups!,
+                          teeth: deriveTeethFromGroups(nextGroups!),
+                        },
+                  ),
+                );
+
+                setLabCaseDrafts((prev) =>
+                  prev.map((lc) => {
+                    if (lc.detailClientId !== activeDetailId) return lc;
+                    return {
+                      ...lc,
+                      toothProsthesis: pruneToothProsthesisForGroups(
+                        lc.toothProsthesis,
+                        activeDetailId,
+                        nextGroups!,
+                      ),
+                    };
+                  }),
+                );
+              }}
+              disabled={!canEditTreatmentForDay || isDetailLocked(activeDetail)}
+            />
+          ) : null}
+
+          {entryStep === 'content' ? (
+            <TreatmentDetailsEditor
+              details={details}
+              activeDetailId={activeDetailId}
+              onActiveDetailChange={setActiveDetailId}
+              onDetailsChange={setDetails}
+              isDetailLocked={isDetailLocked}
+              labDependentCodes={labDependentCodes}
+              treatmentCatalog={treatmentDropdownCatalog}
+              disabled={!canEditTreatmentForDay}
+              canEdit={canEdit}
+              saveStatus={saveStatus}
+              uploadBusy={uploadBusyDetailId === activeDetailId}
+              onAddDetail={() => {
+                const next = newDetail(
+                  defaultTreatmentTypeForAppointment(
+                    selectedAppointment?.purpose,
+                    treatmentCatalog,
+                  ),
+                );
+                setDetails((prev) => [...prev, next]);
+                setActiveDetailId(next.clientId);
+                setEntryStep('teeth');
+              }}
+              onUploadFiles={(files) => void uploadForDetail(activeDetailId, files ?? [])}
+              showChrome={false}
+              showFields
+            />
+          ) : null}
+
+          {entryStep === 'lab' ? (
+            <div ref={labPanelRef}>
+              {showLabShipmentBlocked ? <LabShipmentBlockedNotice /> : null}
+              {showLabDispatchPanel ? (
+                <LabCasesDispatchPanel
+                  details={details}
+                  activeDetailId={activeDetailId}
+                  labCases={labCaseDrafts}
+                  labDependentCodes={labDependentCodes}
+                  treatmentCatalog={treatmentCatalog}
+                  labCaseSummary={activeLabCaseSummary}
+                  locale={locale}
+                  onLabCaseSummaryChange={handleLabCaseSummaryChange}
+                  onLabCaseMarkedRead={handleLabCaseMarkedRead}
+                  onLabCaseActivityChange={() => {
+                    if (historyPatientId) {
+                      void refreshPatientLabCases(historyPatientId, { silent: true });
+                    }
+                  }}
+                  activeLabCaseId={activeLabCaseId}
+                  onLabCasesChange={handleLabCasesChange}
+                  disabled={!canEditTreatmentForDay}
+                  canEdit={canEdit}
+                  orgs={orgs}
+                  organizationSearch={organizationSearch}
+                  onOrganizationSearchChange={setOrganizationSearch}
+                  recentOrganizationIds={recentOrganizationIds}
+                  onRecentOrganizationPick={(orgId) => {
+                    setLabCaseDrafts((prev) => {
+                      const targetId =
+                        activeLabCaseId ??
+                        prev.find((lc) => !lc.sentAt && lc.detailClientId === activeDetailId)
+                          ?.clientId;
+                      if (!targetId) return prev;
+                      return prev.map((lc) =>
+                        lc.clientId === targetId && !lc.sentAt
+                          ? { ...lc, destinationOrganizationId: orgId }
+                          : lc,
+                      );
+                    });
+                  }}
+                  sendBusyId={sendBusyId}
+                  onAddLabCase={() => void handleAddLabCase()}
+                  onSendLabCase={(lc, comment) => void handleSendLabCase(lc, comment)}
+                  onCommentError={showError}
+                  canInviteLab={canAccessOrganizations}
+                  onInviteLab={() => router.push('/organizations?action=invite-lab')}
+                />
+              ) : (
+                <p className="text-sm text-text-muted surface-card p-4">
+                  {t('entryStepLabUnavailable')}
+                </p>
+              )}
+            </div>
+          ) : null}
        </div>
      </div>
    </div>
--- a/frontend/src/lib/api/lab-case-access.ts
+++ b/frontend/src/lib/api/lab-case-access.ts
@@ -5,6 +5,8 @@ export interface LabCaseAccessProsthesisGroup {
  prosthesisTypeCode: string;
  prosthesisTypeLabel: string;
  teeth: string[];
+  connected?: boolean;
+  selectionGroupId?: string;
 }

 export interface LabCaseAccessSession {
--- a/frontend/src/types/cases.ts
+++ b/frontend/src/types/cases.ts
@@ -3,6 +3,8 @@ export type LabTaskStatus = 'IN_PROGRESS' | 'COMPLETED';
 export interface LabCaseProsthesisGroup {
  prosthesisTypeCode: string;
  teeth: string[];
+  connected?: boolean;
+  selectionGroupId?: string;
 }

 export interface LabCaseListItem {
--- a/frontend/src/types/lab-case-activity.ts
+++ b/frontend/src/types/lab-case-activity.ts
@@ -20,6 +20,8 @@ export interface LabCaseActivityItem {
 export interface PatientLabCaseProsthesisGroup {
  prosthesisTypeCode: string;
  teeth: string[];
+  connected?: boolean;
+  selectionGroupId?: string;
 }

 export interface PatientLabCaseSummary {
--- a/frontend/src/types/treatment.ts
+++ b/frontend/src/types/treatment.ts
@@ -58,6 +58,16 @@ export interface LabCaseToothProsthesisDraft {
  detailClientId: string;
  tooth: string;
  prosthesisTypeCode: string;
+  /** Links connected/single selection group for shared prosthesis + lab tasks. */
+  selectionGroupId?: string;
+}
+
+export type ToothSelectionKind = 'connected' | 'single';
+
+export interface ToothSelectionGroup {
+  groupId: string;
+  kind: ToothSelectionKind;
+  teeth: FdiToothId[];
 }

 export interface LabCaseSendInfo {
@@ -79,6 +89,7 @@ export interface PastTreatmentDetail {
  clientId: string;
  treatmentType: TreatmentType;
  teeth: FdiToothId[];
+  toothSelectionGroups?: ToothSelectionGroup[];
  notes?: string | null;
  attachmentMetas?: TreatmentAttachmentMeta[];
  labCaseId?: string | null;
@@ -102,11 +113,13 @@ export interface PastLabCase {
    clientId: string;
    treatmentType: string;
    teeth: FdiToothId[];
+    toothSelectionGroups?: ToothSelectionGroup[];
  } | null;
  toothProsthesis?: Array<{
    treatmentDetailId: string;
    tooth: string;
    prosthesisTypeCode: string;
+    selectionGroupId?: string;
  }>;
  sends?: LabCaseSendInfo[];
  dueDate?: string | null;
@@ -136,6 +149,7 @@ export interface TreatmentDetailDraft {
  id?: string;
  treatmentType: TreatmentType;
  teeth: FdiToothId[];
+  toothSelectionGroups: ToothSelectionGroup[];
  comment: string;
  attachmentMetas: TreatmentAttachmentMeta[];
  labCaseId?: string | null;
@@ -166,6 +180,7 @@ export type SavedTreatmentDetailPayload = {
  id?: string;
  treatmentType: TreatmentType;
  teeth: FdiToothId[];
+  toothSelectionGroups?: ToothSelectionGroup[];
  comment: string;
  attachmentIds: string[];
 };
@@ -182,6 +197,7 @@ export interface SaveLabCasePayload {
    treatmentDetailId: string;
    tooth: string;
    prosthesisTypeCode: string;
+    selectionGroupId?: string;
  }>;
  attachmentIds?: string[];
  dueDate?: string | null;
@@ -204,6 +220,7 @@ export interface LabCaseResponse {
    clientId: string;
    treatmentType: string;
    teeth: string[];
+    toothSelectionGroups?: ToothSelectionGroup[];
  } | null;
  sends: LabCaseSendInfo[];
  dueDate: string | null;