If the pus is still flowing next to the second anti-inflammatory medication for root canal treatment, it may be an apical fistula or periodontal abscess, whose exact healing time is variable and closely related to the condition of the tooth. For apical fistula with pus, it is recommended to clean the root canal again to prevent missing the uncleaned root canal, and to perform apical scratching. If it has not healed after a week, apicoectomy can be used and healing usually occurs in about 2 weeks. In addition, some teeth are often combined with periodontal-endodontic joint lesions, and the pus flowing next to them may also be periodontal abscess, shallow and deep periodontal pockets are often missed, it is recommended to make a clear diagnosis of the periodontal abscess, it is recommended to assist the periodontal sequence of treatment, and if the pus doesn’t go away after the treatment, it is recommended to be extracted. It is recommended to go to a regular hospital stomatology department for consultation.