Hamster Fact: Hamsters are rodents and therefore their teeth continuously grow. They have 4 incisors and 8 molars. If needed, a vet can trim their teeth if they are overgrown. Overgrown teeth can hurt the hamster by growing into their jaws. Supply your little guys with lots of fun things to chew to wear down their teeth. You may want to check their teeth from time to time as well to make sure they are growing properly and not broken.