Toothache after filling can be relieved by gargling with light salt water, using soothing materials, and performing endodontic treatment. It is more normal to have toothache within 1-2 days after filling. During the process of cavity making, the sterilizing medicine may stimulate the tooth pulp and cause toothache, salt water has the effect of sterilization and disinfection, rinsing the mouth with light salt water can play a role in relieving toothache. If painful symptoms appear immediately after the filling, it may be because the filling material has stimulated the tooth and caused tooth pain. It is recommended to remove the filling material and fill the cavity with soothing material. If the tooth is still painful after a period of filling, periapical infection or chronic pulpitis may have occurred and endodontic treatment is required. If the tooth hurts after a filling, it is recommended to go to the hospital as soon as possible to determine the specific cause, choose to use a desensitizing toothpaste, and take pain medication under the doctor’s advice to help relieve the toothache.