Small Pet Dental Health Guide — Preventing Malocclusion & Tooth Problems

Rabbits, hamsters, guinea pigs, chinchillas, degus, and many other pet small animals belong to the orders Rodentia or Lagomorpha and possess "open-rooted" teeth (also called "ever-growing" or hypselodont teeth) that grow continuously throughout life. When these teeth do not wear down properly, malocclusion develops, causing the serious inability to eat. This article provides detailed guidance on dental health management for small animals.

Understanding Small Animal Tooth Structure

Rabbits have 28 teeth total: 6 incisors (front teeth) and 22 molars (cheek teeth). The upper incisors have a unique double structure with small auxiliary teeth (peg teeth) behind the large front teeth. All teeth are open-rooted, growing continuously at approximately 2 mm per week. Normally, upper and lower teeth grind against each other, maintaining proper length through natural wear.

Hamsters have 16 teeth total, with 4 incisors being open-rooted. Molars are fixed (non-growing) teeth. Incisors have a yellowish-orange color from iron content in the enamel -- this is normal. White teeth may actually indicate nutritional deficiency.

Guinea pigs have 20 teeth, all open-rooted -- both incisors and molars grow continuously, similar to rabbits. This makes guinea pigs equally susceptible to molar malocclusion.

Chinchillas also have all 20 teeth as open-rooted. Their molars grow at a particularly fast rate, and malocclusion can develop rapidly.

Causes of Dental Malocclusion

The primary cause is insufficient dietary fiber. Hay (particularly timothy first-cut) requires extensive chewing, which wears teeth evenly. Diets heavy in pellets and treats do not provide adequate chewing action, allowing teeth to overgrow.

Genetic factors play a role -- some individuals are born with jaw misalignment that predisposes them to malocclusion regardless of diet.

Trauma from cage biting, falls, or impacts can shift tooth alignment. Metabolic issues, including vitamin D and calcium imbalances, affect tooth quality and growth patterns.

Recognizing Dental Problems

Watch for these warning signs: decreased appetite or selective eating (preferring soft foods), dropping food while eating, excessive drooling ("wet dewlap" in rabbits), weight loss, facial swelling or lumps along the jaw, eye discharge (upper molar roots in rabbits extend near the tear ducts), and reduced grooming.