An opening from the mouth to the nasal cavity that occurs adjacent to teeth that appear clinically healthy (Figure 1).1-3
Figure 1. (above) Eight-year-old, spayed female Dachshund with normal-appearing gingiva over the buccal aspect of the maxillary left canine tooth (#204). This patient has a history of chronic sneezing. The tooth appears normal visually. Without probing, the problem would be missed.