Numb chin syndrome: dental treatment implications.

Numb chin syndrome (NCS) is characterized by facial numbness and lip paresthesia along the distribution of the mental branch of the trigeminal nerve. Most cases of this syndrome that are not dental in origin are usually associated with malignant tumors or diffuse metastatic disease. This case report emphasizes the necessity for the dentist, when confronted with such a case, to gather all diagnostic information before providing dental treatment.