An abscess on the gums is considered to be a possible oral disease such as acute periapical periodontitis, chronic periodontitis, periodontal abscess, and wisdom tooth pericoronitis. The appearance of such diseases is mostly related to improper cleaning, trauma, bacterial or fungal infection and other factors, as follows: 1. Acute periapical infection: also known as acute suppurative apical abscess or acute alveolar abscess, which can lead to congestion and edema in the corresponding apical area of the patient’s teeth, along with tooth loosening and percussion pain. The disease is mostly due to necrosis of the pulp tissue after endodontic lesions and the entry of bacteria, fungi and other microorganisms resulting in infection, which in turn causes purulent inflammation of the periapical tissues; 2. Chronic periodontitis: a chronic inflammation caused by plaque, tartar, embedded food, etc. invading the periodontal tissues and gums. This disease can cause the patient’s gums to appear pus, overflowing pus symptoms, but also accompanied by tenderness; 3, periodontal abscess: periodontitis to the development of late one of the common accompanying symptoms, sudden onset, often manifested as the formation of periodontal pockets lateral wall hemispherical swelling protrusion. The gums are red, edematous and have a shiny surface. Early abscesses are characterized by extensive inflammatory infiltration, greater tissue tension, and more intense pain. This disease is mostly due to the resorption of alveolar bone in patients with advanced periodontitis, the emergence of deep periodontal pockets, the occurrence of purulent, confined inflammation within their walls, and the failure of pus to drain in time to cause local abscesses; 4. Wisdom tooth pericoronitis: If pus pockets appear in the wisdom tooth area, consider the presence of wisdom tooth pericoronitis. The wisdom tooth cannot erupt normally, resulting in the crown being covered by the gingival flap, thus forming a deeper blind pocket between the crown and the gingival flap. If there are triggering factors such as improper diet and poor cleaning, food residues may remain in the blind pocket, which may generate mixed bacteria and lead to pericoronitis. If the abscess is accompanied by other uncomfortable symptoms such as redness, swelling and pain, the gum needs to be diagnosed and treated in a timely manner. Common symptomatic treatments include local irrigation, debridement, incision and drainage, medication to relieve inflammation, etc. If the abscess is determined to be caused by periapical infection, root canal treatment should also be performed.