If it's a genetic problem, which it may not be..... The rabbit would have to get a bad gene from the mother and the father. If you have a rabbit that carries bad teeth and it's always been bred to a rabbit that doesn't carry bad teeth then the babies would always have good teeth although some would be carriers. However if you bred that rabbit to another rabbit that had, or carried bad teeth then a quarter of the babies would have bad teeth. Because of this if it is genetic then it's a problem for both the parents. There is a big chance that it is nothing wrong with the parents.
I raise mini lops and there was one particular breeding I did with one buck and one doe that produced bad teeth. I have never done that breeding again, but the reason being was because the head shape of the parents was totally different from each other. As they grew their teeth straightened out. The female had a narrow, angular face and the buck had a huge round head, that is what caused the problem because the jaw grew at a different rate then the top of the head. I do not use those rabbits for breeding to each other or any that were produced from this litter that had problems but have never had any problems with these rabbits or their offspring with other rabbits and I've crossed their offspring and no problems. It was just a fluke based on head shape.
My guess, if the rest of the litter is fine then it might be something like that. If so then most likely the rabbit will grow out of it as it gets older. Hay is the best for wearing down teeth. Oddly I've heard it's better then wood, but if you can give them apple or maple sticks they would probably love that too. If they don't straighten out you may end up having to trim the teeth but that is risky and can easily cause bleeding if not done correctly. I wish you the best.
Don't breed these two again unless you are prepared for possibly more teeth problems. However it could be an enviromental problems such as pulling on wire, or something. Or could be abnormal growth of the jaw. Time will most likely tell. If you take some of her former offspring and breed them to your buck then you should be able to see if their are genetic problems associated with this. You will have to breed more then one doe with this though in order to get accurate results.
Before you get rid of him though try him with a few more does, if you have problems then yeah get rid of him, but it might just be a one time thing.