I am sorry that this is happening to you. It may be a difficult case to bring as it will be hard to prove that the tooth extraction caused the TMJ. also, it might be difficult to find an attorney due to the damages being not very large. Attorneys are very particular about the cases that take in med malpractice as they are very expensive. To be sure though, call around to some medical malpractice attorneys in your area and have them evaluate your potential claim.