If your rabbits teeth are overlaping, it has lumps in its mouth, or its eyes are weepy, it may be because of dietry problems. As rabbit's teeth are naturally designed to grind food, there teeth are not always able to function properly when their teeth are not near constantly grinding. Rabbit pellets are one of the most common sources of these problems, as pellets are eaten by chomping straight down, not grinding. Hay and leafy veggies are, after all, supposed to make up about 90% of your rabbits diet, so if pellets are taking over your rabbits diet, maybe check your rabbits teeth. If they are causing pain to your rabbit, or you are concerned, contacting a vet would probably be a good idea.
I hope this is helpful!