With 42 teeth, there are 42 reasons why a dog may need braces. Dental care is very important for all dogs. However, even with great care, one or more teeth may grow out of line. In some cases, a dog's tooth may grow so out of place that it severs into the dog's mouth. A tooth can grow to the side and if intervention is not taken, it could very well keep moving until it is poking into the dog's cheek tissue.
Severely misaligned teeth can cause great discomfort for dogs with can lead to impaired ability to eat. There have even been cases of a tooth growing up into a dog's mouth; the complete opposite direction that it should. This can also cause infections, as skin is slowly punctured; bacteria can grow quickly and cause many health issues.
Aside from fixing individual teeth, there may be a a malocclusion issue. This is a misalignment or incorrect relation between the teeth the two dental arches where they meet each other as the jaws close.
It is in cases such as this, a veterinarian orthodontist can step in and correct the issues.