Tooth decay has rotted empty without pain may need direct repair, root canal treatment, extraction of the affected tooth, etc., the defective volume may need to do crown restoration treatment, it is recommended to go to the hospital for specific examination and treatment. 1. If the decayed tooth is rotten and empty, use dental drill to grind away the soft decayed material, use permanent material to fill the tooth far away from the nerve, put the material to promote the mineralization of dentin near the nerve, and then use the permanent filling material to repair the tooth, and do crown repair if the defect area is large. 2. If there is a shadow on the root tip of the cavity and the pulp cavity is exposed, root canal treatment can be done to remove the nerve from the root canal of the tooth and then fill the root canal, and then crown restoration can be done after observing no symptoms at a later stage. 3. If the decayed tooth has broken down to the bottom of the pulp chamber, the tooth can be extracted in time.