Pain after two months of root canal treatment of the tooth, if it is uncontrolled periapical periodontitis need to re-root canal treatment, apical cysts need to do apical surgery, can not be retained need to be extracted. 1. Root canal treatment. If the tooth is still painful after two months of root canal treatment, it may be that the root canal treatment is not perfect or the periapical inflammation has not been controlled, according to the situation, it is necessary to consider re-endodontic treatment to eliminate the inflammation. 2. Apical surgery. Pain after two months of root canal treatment may also be caused by apical cysts, which cannot be eliminated by root canal treatment and can only be solved by apical surgery to remove the cyst. 3. Tooth extraction. Pain two months after root canal treatment may be caused by chewing too hard food without crown, causing longitudinal fracture of the tooth, and tooth extraction should be considered after radiographic examination. Root canal treatment two months after the pain can still be seen in a variety of different reasons, specific need to go to the hospital to check the targeted treatment.