Method one: find a few buddies, take a good guy to repair him a meal. If the other guy hasn't been hospitalized yet, then you ask him to beg to give you financial compensation (dentists earn a lot of money, so I suggest not being soft).
Method 2: find 3 a hospital experts to do medical malpractice appraisal (premise you know the hospital doctor), if you do not know a doctor in the hospital, it is better to forget about it, the doctor is also a medical doctor care ah (the doctor does not want to get into trouble). After the identification, if it is the doctor's problem, you can go to the Health Bureau or the local Medical Affairs Section to reflect this matter, and ask for the revocation of his license to practice (such a doctor is expected to have no professional qualification certificate. You can ask him to show you, if not, he is practicing medicine illegally) or seize his clinic. Then go to court to take civil action for financial compensation.
In fact, a very young child's teeth will grow back when they fall out, and an older child can have porcelain teeth. You should not be too angry. The most important thing is to make peace with the situation. If the family has the conditions, it is recommended to use the second one. If the family does not have the conditions, then come to the first (for civilians only fist to speak).