The treatment of toothache after filling varies from person to person: 1. For patients whose nerve is not necrotic, the filling material may stimulate the nerve causing pain after filling, just keep observation at the initial stage; 2. Patients with severe pain after filling, affecting sleep and forming pulpitis need to reopen the tooth for sequential treatment such as nerve killing and root canal treatment; 3. If the material of both the affected tooth and the opposing tooth is metal, electric current will be formed under the action of saliva causing toothache, it is recommended to replace the filling material.