Underbite

Underbite

Also known as a Class 3 occlusion, an underbite can result in a painful tooth-to-tooth contact or tooth-to-gum contact for your dog.

Dr. Stephen Juriga headshot

Originally published by Stephen Juriga, DVM · part of the AOSN network.

Signs you might notice

What you need to know

One or both lower canine teeth can strike an upper incisor tooth or gum tissue.

What you need to know

Normal for some breeds like the Boxer, Boston Terrier, and Bulldog.

What you need to know

Breeds like Shih Tzu, Lhasa Apso, Maltipoo, and Cavoodle seem to be more prone to tooth-tooth contact.

What's really going on

An underbite or class 3 occlusion is a concern when there is tooth-to-tooth or tooth-to-gum contact. In some breeds, this is their “normal occlusion” like the Boxer, Boston Terrier, and Bull Dog breeds. However, Shih Tzu, Lhasa Apso, Maltipoo, Cavoodle and other breeds can have one or both lower canine teeth that strike the upper incisor tooth or gum tissue.

How it may look

Lower canine teeth striking the upper incisor teeth
Lower canine teeth striking the upper incisor teeth
Another example of tooth-to-tooth contact
Another example of tooth-to-tooth contact

How a specialist helps

Selective extraction of the least functionally important tooth to allow the other tooth to erupt into a non-traumatic position. In some cases, orthodontic therapy is performed to tip a tooth into a non-traumatic position.

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