Gums long pus but no pain is mainly caused by periodontal abscess or periapical abscess, it is recommended to see a doctor for periodontal or root canal treatment. 1. Periodontal abscess: poor oral hygiene will produce a large amount of tartar or calculus and other inflammatory substances, which leads to the emergence of gingivitis or periodontitis; if the symptoms are aggravated, there will be swelling of the gum tissue overflow of pus and other symptoms (i.e., periodontal abscess), but generally there is no obvious pain; must be treated by periodontal therapy or abscess incision and drainage in order to reduce inflammation and swelling quickly and effectively. 2. Apical periodontitis: it is mostly caused by pulpitis without timely treatment, resulting in continued inflammation of the nerve necrosis and inflammation of the periapical tissues of the teeth; the relevant inflammatory substances will spread to the periodontal tissues through the apical foramen, which in turn causes pus in the gums, and also no obvious pain symptoms; must be treated with endodontic therapy to clean up inflammation in the root canal in order to achieve the purpose of root canal treatment. It is recommended to consult a doctor in time for examination and treatment.