Gum abscess, generally considered to be caused by apical abscess, apical cyst, periodontal abscess, etc., the treatment for root canal treatment, surgical resection, periodontal foundation treatment. 1.apical abscess: gingival abscess, such as localized abscess, mostly considered to be the root tip of long-term inflammation, pus caused by the formation of fistula. Fistula mouth is located in the root tip of the tooth on the buccal side of the lips, will repeatedly flow pus. The treatment is mainly root canal therapy, removing the infected pulp tissue, anti-inflammatory to cure. 2. Apical cysts: Long-term apical inflammation will form apical cysts, which can also be manifested as gingival abscesses. Root canal treatment alone cannot solve the problem, and cystectomy is needed to surgically remove the complete cyst formed at the root tip. Gingival abscess will disappear. 3. Periodontal abscess: due to periodontal disease, it can be manifested as localized or mouth-wide gum abscess. The treatment is basic periodontal treatment, removing calculus through scaling and scraping, alternating rinsing with saline and hydrogen peroxide, and periodontal medication such as minocycline hydrochloride and iodized glycerin. Regular review will prevent recurrent gum abscesses. Gum abscess phenomenon, it is recommended to go to the regular hospital as soon as possible to check the diagnosis and treatment, not at home to deal with or use medication.