Welcome to binkybunny!
From the picture on your profile, your bunnies look pretty young. Have they been to a rabbit savvy vet yet for an initial checkup? This would be good to do to make sure that they’re all in good health.
Do you have any pictures of the teeth you believe are overgrown? If they are overgrown, you will need to take him/her to the vet. The vet can check out the front teeth and the peg teeth in the back and see if they will need getting their teeth trimmed. If the teeth are badly overgrown, a chew toy will probably not do very much at this point.
Also, I was wondering if you feed your bunnies hay. Hay is extremely important for them to have so it can wear their teeth down. Are all of you bunnies housed together? I noticed on your profile that they are not spayed or neutered. If they are living together, you will need to separate them, otherwise they will not be able to live together peacefully.