Guinea pig dental malocclusion

What is it?

Dental malocclusion is a misalignment of a guinea pig's teeth that prevents them from wearing against each other normally. \n\nIn guinea pigs, all teeth grow continuously throughout life, both the incisors at the front and the molars at the back of the mouth. When alignment is correct, chewing wears down the teeth over time. \n\nWhen alignment is disrupted, teeth grow erratically, form sharp points and injure the tongue or cheeks. This is a very common problem in this species and a major cause of veterinary consultation.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Causes and risk factors

The most common cause is a diet low in fiber, with too little hay and too many pellets or soft vegetables. Without long chewing fibers, teeth do not wear down properly. \n\nA genetic predisposition or congenital malformation of the jaw may also be involved, with certain bloodlines being more prone to this problem. \n\nA lack of vitamin C, a calcium deficiency, trauma to the jaw, or an illness that limits chewing can also promote irregular wear of the teeth.

A diet consisting mainly of pellets or soft foods, without hay as desired, greatly increases the risk. \n\nAdvanced age, family heredity, vitamin C or calcium deficiency, as well as a history of facial trauma are contributing factors.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

Treatment

The main treatment consists of filing the tips and overlengths of the teeth under anesthesia, an intervention called “dental grinding”, to be repeated regularly depending on progress. \n\nPainkillers and sometimes anti-inflammatories are prescribed to relieve the animal during convalescence. \n\nNutritional support, with assisted feeding if necessary, helps maintain weight while the mouth is painful. \n\nIf a dental abscess is present, antibiotic treatment and sometimes local surgery may be necessary.

Prevention

Possible complications

Untreated malocclusion can lead to deep mouth sores, dental abscesses, severe weight loss, or even a complete cessation of feeding that puts the animal's life at risk. \n\nThe roots of diseased teeth can also compress the eyes or tear ducts, causing eye problems.

When to see a veterinarian

Prognosis

The prognosis is favorable if the malocclusion is treated early and regularly monitored, the animal being able to regain normal eating comfort after grinding. \n\nHowever, it is often a chronic problem requiring repeated interventions for life, particularly when the cause is genetic or anatomical.

Frequently asked questions

References

WSAVA — World Small Animal Veterinary Association

AVMA — American Veterinary Medical Association

Cornell Feline Health Center

Content reviewed by the TunisieVet editorial team · Updated 19 September 2026