He's got a broken tooth, which isn't usually a problem, but may mean that he needs a couple of trimmings until things even up again. He may not be able to pick up his food with them being as mismatched as they are. I'd see a vet, but his molars also need to be checked under light anesthesia, and he needs skull x-rays to check for elongated roots.
What is his diet? What kind of hay? What kind of pellets, and how many? What veggies, and how many of each?