Swollen gums with pus squeezed out soon and again, may be due to a variety of causes, such as gingivitis, periodontal abscess, periapical inflammation, etc. The more serious lesions can form pus. It is recommended that patients promptly go to the hospital stomatology department, by the doctor to clarify the specific causes, and timely treatment. A cause 1, gingivitis: gingivitis occurs mostly with poor oral hygiene habits, food embedding, dental calculus, plaque and other long-term presence, can be accompanied by brushing or gingival bleeding when biting hard objects, some patients with more serious inflammation can appear swollen gums and pus overflow; 2, periodontal abscess: more from the development of inflammation around the teeth, or gingival tissue is damaged secondary to infection, often appearing local redness and swelling of the gums, the Some patients may have loose teeth; 3, periapical infection: mostly caused by local stimulation or trauma, bacterial infection, often appearing gingival flushing, swelling, local elevation, sometimes pus outflow; 4, other: may also be caused by dental caries leading to pulp necrosis, inflammation spread to the gum, root of the tooth after the formation of sinus tracts, gingival abscess, accompanied by pus outflow, etc. phenomenon. Treatment 1, scaling: patients with plaque, calculus and other undesirable irritants can improve the symptoms of gum abscess by scaling; 2, medication: local rinsing with anti-inflammatory solution, such as saline, hydrogen peroxide solution, chlorhexidine rinse, etc., can promote the elimination of inflammation. Some patients with serious symptoms can also take oral anti-inflammatory drugs such as metronidazole, amoxicillin and cephalosporin to control the infection; 3, surgical treatment: surgical incision can also be made to drain the pus and rinse the pus cavity to promote the elimination of inflammation; gum abscess caused by serious endodontic disease, root canal treatment is also required to remove necrotic pulp and purulent material, which can effectively improve the symptoms.