Burnett had an overbite resulting in a weak chin, and her daughter had an underbite. Due to maxillary hypoplasia, people with Crouzon syndrome generally have a considerable permanent underbite. It has a large mouth with an underbite, lined with prominent sharp teeth. His prominent underbite earned him the nickname "Queixada", which means "jaw". Their teeth occlude in either an underbite or an end-to-end bite. They have strong jaws with a very mild underbite, and widely spaced canines. The underbite not so pronounced as that in the English Bulldog. Growing up, he had a severe underbite, for which he underwent corrective surgery. The opposite condition is considered to be an underbite, which is rare in theropod dinosaurs. They have domed heads, short noses, and an underbite. A very noticeable feature is the underbite, which is required in the breed standard. The mouth is small and set in an underbite. He is commonly recognized by his large underbite and his constant blank facial expression. These curvatures may be the result of an incisor malocclusion (e.g. ventral=overbite/dorsal=underbite). They have large, pointed heads with an underbite in many species.