Malocclusion means the upper and lower teeth don't meet the way they should. Veterinary dentistry sorts it into four classes, from a jaw-length mismatch to individual teeth pointing the wrong direction. What determines whether it matters is simple: does a tooth strike soft tissue or another tooth? A crooked bite that touches nothing is cosmetic. One that hits the palate is not.
What does a correct canine bite look like?
In a scissor bite, the upper incisors sit just in front of the lower incisors with the lower edges touching the inner surface of the uppers. The lower canine slots cleanly into the gap between the upper third incisor and the upper canine, touching neither. Premolars interlock in a zigzag, each upper cusp landing in the valley between two lower ones.
That interdigitation is the part worth memorizing. When you look in a healthy mouth from the side, the premolar cusps should form a tidy sawtooth pattern with nothing colliding. Break that pattern and something is bearing pressure it wasn't designed for.
What are the four classes?
- Class I — jaw lengths are normal, but one or more individual teeth are out of position. Includes lance canines, base-narrow lower canines, and rotated premolars.
- Class II — the lower jaw is shorter than the upper. The lower canines end up striking the palate behind the upper incisors.
- Class III — the lower jaw is longer, producing the undershot look standard in Bulldogs and Boxers.
- Class IV — asymmetric, with one side of the jaw longer or shifted relative to the other. Sometimes called wry bite.
Class III is a breed standard in some dogs and a defect in others, which tells you how much of this is convention rather than biology. A Bulldog's undershot jaw is expected. The same jaw on a Border Collie would warrant a conversation.
Which malocclusions actually cause pain?
The ones where enamel meets soft tissue. A base-narrow lower canine — a Class I problem where the tooth tips inward instead of standing upright — presses into the palate every time the mouth closes. Dogs with this often develop a visible pit, sometimes deep enough to communicate with the nasal passages.
Class II bites create the same collision through a different route. The short lower jaw parks both lower canines against the roof of the mouth. Puppies with this frequently stop eating hard food, chew on one side, or hold the mouth slightly open, and owners read it as fussiness.
Lance canines, where an upper canine points forward like a tusk, trap the lower canine and can wear a groove into it. Any puppy whose lower canines are contacting the palate deserves a same-week call to your veterinarian, because in a growing jaw the timing of intervention changes what's possible.
Do puppy bites correct themselves?
Sometimes. Upper and lower jaws grow at different rates and in spurts, so a bite that looks off at ten weeks can normalize by six months. Most independent growth happens before roughly 16 weeks.
The complication is that deciduous canines can physically lock a growing jaw in place. If a baby lower canine is trapped behind an upper one, the mandible cannot lengthen past it. Removing the offending baby tooth early — interceptive orthodontics — sometimes lets normal growth resume. That decision belongs to a veterinarian who can see the mouth, and it has a narrow window.
How do you care for a misaligned mouth day to day?
Accept that coverage will be uneven and plan around it. Teeth that don't contact their opposite number receive no self-cleaning from chewing, so they collect plaque faster than their neighbors. Find those teeth once, remember where they are, and give them the extra ten seconds.
A chew helps on the teeth that do make contact. Brushless Toothpaste uses a ridged outer texture and a softer inner paste-like core containing chlorophyll, alfalfa, and cinnamon — ingredients associated with breath freshness rather than any therapeutic effect. In a crooked mouth it will clean some surfaces well and others barely, which is honest and worth knowing. Track the misses yourself.
For puppies still cycling through teeth, our teething timeline shows what should be gone by when.
What can a veterinary dentist actually do?
More than most owners expect. Options include crown reduction with a vital pulp treatment, which shortens an offending tooth and seals it so it no longer strikes tissue. Orthodontic devices — inclined planes, elastics, buttons — can tip a canine into a functional position over several weeks. Extraction remains the definitive answer when a tooth is both misplaced and unsalvageable.
The goal in every case is a comfortable, functional bite, not a show-ring one. Moving teeth for appearance in a dog is considered unethical by most veterinary dental organizations, and breeding a dog with a heritable malocclusion is discouraged for the same reason.
Frequently asked questions
Is an undershot bite painful for my Boxer?
Usually not. Class III malocclusion is standard in brachycephalic breeds, and the jaw and teeth develop together in a way that avoids soft-tissue contact. The thing to watch is exposure — lower incisors that sit outside the lip dry out, accumulate calculus faster, and are more prone to fracture from impact.
My puppy's lower canines poke the roof of her mouth. Will she grow out of it?
Don't wait to find out. If the tooth is already indenting the palate, it can be causing pain and creating a defect while you watch. A veterinarian may recommend extracting the deciduous canines to release the jaw and allow more normal growth, and that option narrows considerably after about 16 weeks.
Can adult dogs get braces?
Orthodontic appliances exist for dogs and are placed by veterinary dentists, most often to tip a canine out of a damaging position. They are used for function, not aesthetics. Treatment usually runs several weeks with recheck appointments, and the dog wears a device that is far simpler than human braces.
Does malocclusion get passed to puppies?
Many forms have a heritable component, particularly jaw-length mismatches and lance canines in Shetland Sheepdogs. Responsible breeders screen for bite faults and remove affected dogs from breeding programs. A dog whose malocclusion was corrected surgically or orthodontically should not be bred, since the underlying genetics are unchanged.
Should a crooked-toothed dog eat softer food?
Only if chewing is visibly uncomfortable. Softer diets reduce mechanical cleaning and tend to increase plaque accumulation, so switching without cause trades one problem for another. If your dog is dropping kibble, chewing on one side, or eating slowly, that's a symptom to investigate rather than to accommodate.