Gum swelling and toothache may be caused by diseases such as periodontal abscess or periapical abscess. Periodontal abscess can be treated by local flushing and incision and drainage of pus, while periapical abscess can be treated by incision and drainage of pus and root canal. Severe symptoms can be assisted by oral or intravenous anti-infection treatment. 1. Periodontal abscess: In the early stage of abscess, large pieces of tartar can be gently removed and the periodontal pockets can be rinsed with saline. After the abscess is formed, according to the site of abscess and the thickness of mucous membrane on its surface, the pus can be drained out from the periodontal pockets or the gingival surface. 2. Periapical abscess: If the abscess is located under periosteum or mucosa, incision and drainage can be made under local anesthesia, and the opening of pulpal cavity can be carried out at the same time or the opening of pulpal cavity can be carried out at the same time, and then incision and drainage can be made after the abscess is mature, and then perfect root canal treatment can be carried out. If the symptoms are serious, oral or intravenous anti-infection treatment, such as cefuroxime, metronidazole and so on, can be prescribed by the doctor. It is recommended to visit a regular medical institution to receive professional treatment.