Worm teeth rot a hole in the odor and black if there is no injury to the nerve can be repaired; if the nerve is injured, it is recommended to repair after root canal treatment; if there is no preservation value is recommended to be extracted. 1. The tooth has a hole stinks and black is that the tooth is decayed, bacteria in the cavity for a long time caused by fermentation, it is recommended to remove the decayed tissue of the tooth. If the nerve of the tooth is not injured, it can be repaired with glass ionomer or composite resin material after sterilization and drying. 2. When removing the decayed tooth tissue, if the nerve is found to be injured, it is best to repair the tooth after root canal treatment. Direct repair can cause pulpitis and pain. 3. If the decayed area of the tooth is too large and the root bifurcation is damaged, there is no preservation value, it is recommended that the tooth can be extracted and then repaired after the wound has healed. It is recommended to go to the hospital for examination and treatment.