If the tooth is still inflamed after root canal treatment, you can choose anti-infection treatment, root canal re-treatment, periodontal treatment, etc. according to the situation. 1. Anti-infection treatment: If the inflammatory reaction is heavy after root canal treatment, you can choose to take oral cephalosporin drugs, such as cefixime capsule, cefaclor capsule, etc., to relieve the inflammatory reaction. 2. Root canal retreatment: If the tooth is still inflamed after root canal treatment, it is possible that there is a residual nerve that has not been cleaned up. It is necessary to carry out root canal retreatment to remove the tip of the filling, and then carry out perfect root canal preparation, root canal disinfection, root canal filling, and finally crown restoration. 3. Periodontal treatment: periodontitis or periodontal pulp, periodontal joint lesions caused by the teeth after root canal treatment is still inflamed, you need to choose according to the circumstances of the supragingival scaling and subgingival scraping; if the situation is serious, you may need to carry out periodontal surgery; the most important thing is to maintain good oral hygiene consistently. Dental root canal treatment is still inflamed, there may be other ways to deal with, it is best to go to the hospital in a timely manner, after a professional physician’s examination, to determine the best treatment program. Under the guidance of the physician to use drugs.