Over a period of 5 months, 18 patients with one or more cracked teeth were treated. Mandibular first molars and maxillary premolars were the teeth most frequently affected. The least affected teeth were mandibular premolars. Predisposing factors for cracked-tooth syndrome are decreased stability (such as caries or poor cavity design) and overloading of the tooth. Treatment involves initial reinforcement and a circumferential cast restoration.