A swollen bag on the tooth bed may be chronic apical periodontitis, wisdom tooth pericoronitis or alveolar abscess, which can be treated with root canal, medication or surgery according to the situation. 1. Chronic periapical inflammation: when the tooth chronic periapical inflammation, inflammation from the tip of the root can break through the periosteum to reach the gums, causing alveolar abscess, gums appear pus, if there is fluctuating sensation, the need for surgical incision and drainage, root canal treatment is generally carried out to remove the inflammation of the periapical periodontitis. 2. Wisdom tooth pericoronitis: If wisdom tooth pericoronitis occurs, the gums around the tooth may appear red, swollen, overflowing pus, at this time you need to use saline to rinse the gingival pocket, iodine povidone, eliminate the inflammation, and then consider removing the wisdom tooth. 3. alveolar abscess: due to periodontal inflammation or gingival inflammation, can cause alveolar abscess gum abscess, generally have a fluctuating sense of incision and drainage, and then take antibacterial drugs such as amoxicillin, metronidazole treatment. Swelling a bag on the bed of the teeth, the specific need to go to the hospital to check the cause of the disease and then targeted treatment, the use of drugs need to follow the doctor’s instructions.