How long it takes for the pus to subside after root canal treatment needs to be judged according to the individual situation, which is about 1~2 weeks. After root canal treatment, pus may be produced, the specific time to subside is about 1~2 weeks, but each patient’s physical condition is different, and the later symptoms are different, so the time to subside can not be determined. Some patients with persistent lesions or inflammation may lead to prolonged pus subsidence, which may take 2~3 weeks or even longer. If the pus does not subside for a long time, surgical treatment may be required, such as apical surgery, incision and drainage of pus, and anti-inflammatory medications, such as metronidazole, amoxicillin, etc., need to be used under the guidance of the physician as appropriate. Usually need regular medical checkups, pay more attention to dietary regulation, keep a light diet.