Article / Updated 03-26-2016
With their short, broad heads and flat faces, Boston Terriers don't have a lot of space for their jaws and teeth. As a result, their jaws may develop abnormally and their mouths tend to be crowded, causing misaligned teeth and jaw problems.
The technical terms for these conditions are prognathia and teeth crowding:
Prognathia: This condition occurs when the dog's mandible, or lower part of the jaw, is longer than his maxilla, or the upper jaw.