回複：洗牙把牙齒洗壞了，我哭！

In addition to what Wal-mart had addressed, you also need to prove causation, i.e the deep cleaning caused the problems of your teeth. Without an expert's opinion, it is hard to prove that the cracks in your teeth are actually caused by the deep cleaning. Furthermore, you have to show that the dentist who performed the cleaning for you did something which was deviated from the standard care of his profession. You need a good lawyer if you want to file a medical malpractice case.