According to the situation, we can choose the treatment measures such as tooth repositioning, immediate implant restoration and crown restoration. 1. Teeth reset: teeth can be completely dislocated after falling out of the teeth contained under the tongue, or soaked in saline, milk, teeth into the alveolar fossa reset within two hours, and then choose the arch splint ligation fixation, no need to eat the affected teeth within two weeks, 3 to 4 months the roots can gradually restore stability. 2. Immediate implant restoration: If the tooth is completely dislocated for more than two hours after being knocked out, and the alveolar process is not fractured, immediate implant restoration can be carried out, and crown restoration can be carried out after the bone heals well in 3~6 months. 3. Crown restoration: after the tooth is knocked out, only the root is left and the root is stable, in this case, a root canal treatment can be carried out, and then crown restoration. After the tooth has been broken down, go to the hospital in time and choose the best treatment plan under the advice of a professional doctor.