Rabbits teeth can be misaligned. This condition is known as a malocclusion, which means that their constantly growing teeth do not wear properly. If the misalignment is bad, the teeth will need to be clipped periodically so that the rabbit can eat. One of my rabbit’s teeth must be clipped weekly, but it is usually required on once every 2 – 4 weeks. Your vet or Rabbit Haven can do this for you or show you how to clip your rabbit’s teeth at home. The misalignment of the front teeth can be easily seen. The back teeth usually cannot be seen and the vet may have to anesthetize the rabbit in order to check their molars. One indication that their back teeth may be a problem, is a wet chin that is caused by drooling.
Excellent article on dental issues in rabbits, with very clear diagrams that will help you understand the various possible conditions.