Overgrown Teeth
A dental condition in rabbits, guinea pigs, chinchillas and other continuously-growing-toothed pets where teeth become too long due to poor wear, causing pain and eating difficulties.
Also known as Dental Malocclusion, Overgrown Molars, Elongated Teeth, Slobbers
Overgrown teeth mainly affect animals whose teeth never stop growing, which includes rabbits, guinea pigs, chinchillas, degus and other rodents kept as pets. Vets call these teeth "elodont", meaning they grow continuously throughout the animal's life, sometimes by around a centimetre a month in the front teeth of rabbits. In the wild, this constant growth is balanced out by hours of grinding on tough grasses and fibrous plants. In a home environment, if the diet is too soft or the teeth don't meet properly to wear each other down, that balance breaks and the teeth simply keep getting longer.
The underlying problem is usually called malocclusion, which just means the upper and lower teeth aren't lining up the way they should. It can be something an animal is born with, particularly in flat faced or dwarf breeds where the jaw shape crowds the teeth, or it can develop later from an inappropriate diet, injury, or weakened jawbone. Once the teeth stop meeting correctly, they don't wear evenly, and the imbalance tends to get worse over time rather than better.
Overgrown front teeth (incisors) are the easiest for an owner to spot since they curve outward and become obviously too long. The back teeth (cheek teeth) are harder to see but often more serious, since they can develop sharp spurs that dig into the tongue and cheeks with every bite. This is genuinely painful, and it's a major reason why affected pets go off their food. Left untreated, the roots can also push into surrounding bone or tissue, leading to abscesses, eye problems, or jaw infections. Reduced appetite and effort chewing were in fact the most commonly recorded signs in a large review of rabbits treated for dental disease.
Because these animals instinctively hide pain, it's easy for the problem to be well underway before you notice anything wrong. Signs worth watching for include:
- Drooling or wet fur around the chin, sometimes called "slobbers" in chinchillas
- Weight loss or a sudden drop in food or hay intake
- Dropping food, choosing only soft items, or chewing awkwardly
- Smaller or fewer droppings than usual
- Watery eyes or discharge, which can mean tooth roots are affecting the tear ducts
- Lumps or swelling along the jawline
- Visibly long or crooked front teeth
None of these signs are things to wait out. Overgrown teeth don't correct themselves, and pain from sharp spurs or infected roots only builds the longer it goes on. A vet examination, often needing sedation to see the back teeth properly, is how the problem gets confirmed and treated, usually by filing or trimming the teeth back to a workable length and shape. Diet is central to prevention too: plenty of coarse, fibrous forage such as hay or grass is what gives these teeth the grinding action they need to wear down naturally, something several welfare and veterinary sources agree on as the single biggest factor an owner can control. The guides and clinics listed below go into the specifics for your particular pet and what ongoing care usually looks like.
