You can always file a complaint with the dental board in your state. They will review your complaint and you might have to go before the board with the dentist to solve the problem and make him pay if he was responsible. I would first do as Yoda suggested and get a second opinion so you know if it was something he did or something that just happened. I have seen this happen before patient go's in for one tooth problem and another problem arises with another tooth especially if you have not been to a dentist in awhile. I hope everything works out for you. Tooth problems can really be a pain in more ways than one.