Repeated inflammation of root canal treatment should be based on different causes to take different treatments, common causes are imperfect root canal treatment, apical infection is not cleaned up, residual pulp inflammation and inflammation, etc. Commonly used treatments include re-filling of root canals, medication and so on. 1. Imperfect root canal treatment: imperfect root canal treatment will cause inflammation, the gum tip of the last root canal treatment should be removed, and then the root canal should be filled again to repair the tooth. 2. Root tip infection is not cleaned up: if the tissue around the root tip has been infected before root canal treatment, and the infection is not cleaned up completely during root canal treatment, it will cause repeated inflammation, at this time, antibiotics such as penicillin and metronidazole should be taken under the guidance of the doctor to treat the problem, and then root canal filling can be carried out after the inflammation manifestation has disappeared completely. 3. Inflammation of residual pulp: If the infected pulp is not cleaned out during root canal treatment, resulting in part of the residual pulp remaining in the root canal, it will cause recurrent inflammation, at this time, the pulp cavity should be opened to completely remove the residual pulp, and then re-filled. Repeated inflammation of dental root canal treatment should be promptly go to the hospital to find out the cause and targeted treatment.