First of all, if you want to check up on your rabbit’s teeth, make sure that they are suitably tame. You wouldn’t want to get bitten by one. Gently pull back the rabbits cheeks and check that the teeth are nice and sharp and that they have been evenly worn down.
Rabbits’ teeth need to be kept healthy
The rabbit’s top teeth should overlap the bottom ones ever so slightly. If you think that your bunnies' teeth are getting a bit too long, make sure that you are supplying them with lots of hay, as this is the most abrasive part of a rabbit’s diet.
Sometimes, either through bad genetics or bad diet, a rabbit’s teeth can overgrow. If this has happened to your rabbit, take them to the vets to have their teeth safely burred down.