diff --git a/frontend/src/components/ui/treatment/VoiceReviewSheet.tsx b/frontend/src/components/ui/treatment/VoiceReviewSheet.tsx
index e55e041..25f22ac 100644
--- a/frontend/src/components/ui/treatment/VoiceReviewSheet.tsx
+++ b/frontend/src/components/ui/treatment/VoiceReviewSheet.tsx
@@ -69,12 +69,23 @@ export function VoiceReviewSheet({
   const selectedCount = countSelected(selection, available);
 
   const pickCandidate = (tooth: FdiToothId) => {
-    setChosen((prev) =>
-      prev.includes(tooth) ? prev.filter((t) => t !== tooth) : [...prev, tooth],
-    );
-    // The teeth row starts unticked whenever the recording produced no teeth of its own,
-    // and a picked tooth that is not ticked applies nothing.
-    setSelection((prev) => (prev.teeth ? prev : { ...prev, teeth: true }));
+    const nextChosen = chosen.includes(tooth)
+      ? chosen.filter((t) => t !== tooth)
+      : [...chosen, tooth];
+    setChosen(nextChosen);
+    setSelection((prev) => ({
+      ...prev,
+      // The teeth row starts unticked whenever the recording produced no teeth of its own,
+      // and a picked tooth that is not ticked applies nothing.
+      teeth: true,
+      // The picked tooth has no prosthesis type, which makes the map unshippable. Leaving
+      // the row ticked would apply a map that `assertCompleteToothProsthesisMap` rejects
+      // at dispatch — the exact failure the never-auto-tick-incomplete rule exists to
+      // prevent. Only ever unticks: re-ticking is the clinician's call.
+      prosthesis:
+        prev.prosthesis &&
+        withChosenTeeth(result, nextChosen).prosthesis?.complete !== false,
+    }));
   };
 
   const labelFor = (code: string | null, catalog: { code: string; label: string }[]) =>