It is recommended that root canal treatment should be performed promptly after nerve removal to prevent bacteria from re-entering the root canal and causing root canal and periapical infections, as described below. A complete root canal treatment includes root canal preparation, root canal disinfection, root canal filling, followed by restoration of the tooth to completely isolate the bacteria. After removing the nerve, disinfecting medication is usually inserted into the root canal, and then the cavity is temporarily closed with various types of cementum, such as zinc oxide eugenol, glass ionomer, etc. These materials have limited strength and will break off if used for a long period of time, and saliva, microorganisms, food residues, etc. enter the root canal, which will cause inflammatory infections in the root canal and periapical area again, affecting the treatment effect. It is recommended to go to the hospital to receive professional treatment.