Often patients ask about gum “bulge”, often patients do not pay enough attention to the delay in treatment, making the disease aggravated, there are a few patients are too panic, today to talk about the gum “bulge”. 1, recognize the gum “bulge” gum “bulge”, the most common is the apical abscess (may also be periodontal abscess, etc., this paper does not introduce), the abscess broke or incision and drainage after the formation of fistula, inflammation into the chronic phase, later may be recurrent, that is, often appear Gingival “bulge”. Gingival fistula is a manifestation of chronic inflammation of the tooth apices, the most common reason is: dental caries causing pulp inflammation and then develop to periapical inflammation. In the stage of periapical inflammation, there is pain and swelling of gum, and fistula is formed after breaking down, and the pain is relieved and enters the chronic stage, and if it is not treated in time, there may be acute attack again, and so on repeatedly. Other causes include various reasons that may cause pulpal inflammation, such as dental trauma and developmental malformations. 3, the treatment of gingival fistula Gingival fistula is found to be treated in a timely manner, not because there are no painful symptoms do not go to treatment. Some patients think they are well after the acute attack is relieved by oral anti-inflammatory drugs, so they don’t go for treatment, which is also wrong. Generally, the apical lesion should be examined by radiographs: if it can be cured by root canal treatment, root canal treatment should be performed (see my related section). If the apical lesion is serious and cannot be cured, the tooth should be extracted. 4. Special reminder of several issues (1) The fistula should be taken seriously, as its long-term presence can affect the development of permanent teeth (please refer to my related section). (2) Fistulas without painful symptoms are not without inflammation and still need to be treated.