Lagomorphs, which include the common pets, rabbits and hares (and cotton tails and picas) have teeth which grow and erupt continuously. This is because they eat grass which is abrasive and wears the teeth down. If these animals are not fed a diet of predominantly grass, the teeth will overgrow causing severe problems for the animals.
The dentition of rodents are divided into two groups: those found in Guinea Pigs and Chinchillas, where the teeth grow and are erupted continuously; and those found in rats, mice, gerbils and hamsters, where the incisors grown and erupt continuously and the cheek teeth have a limited grown period and do not erupt continuously. Smaller rodents gnaw with their incisors so appropriate material must be provided to keep the incisors appropriately worn.
If you have any doubt about your pet’s teeth, Cedric Tutt will control them and answer all your questions.