(A) Intraoral photograph of severe (grade 4) infundibular caries involving the infundibula of tooth 109 in a horse. (B) Photograph of undisplaced midsagittally fractured tooth 110 in a horse. Forage is packed into the common infundibular area, and the buccal and lingual fragments are beginning to drift apart. (C) Dorsoventral radiograph of a horse, showing infundibular defects (arrows) in the right upper first and second molars (teeth 109 and 110).