The tip of the gum beyond the apical foramen is known as overfilling, which may cause pain after root canal treatment. The treatment is to remove the root canal filling, and re-prepare the root canal and fill it again, and if there is apical lesion, apical surgery is feasible, as follows. After root canal overfilling, the adhesive and sealant beyond the apical stop, as well as the infected debris pushed out of the apical foramen can produce continuous irritation to the periapical area, resulting in postendodontic pain, which is not effectively relieved by postoperative observation. The root canal filling should be removed, and the root canal system should be thoroughly mechanically and chemically prepared again, and the source of infection eliminated, and then the root canal should be re-filled. If there is over-preparation of the apical area, an apical barrier can be used to close the apical foramen. If the apical lesion remains untreated, apical microsurgery is indicated. It is recommended to go to a regular medical institution to receive professional treatment.