Swelling of the flesh at the very back of the tooth may be due to eruption of wisdom teeth, pericoronitis of wisdom teeth, gingivitis or periodontitis. 1. If wisdom teeth begin to erupt in the posterior cushion position of the distal middle molar after the eruption of the second permanent molar, it may result in painful, swollen gums, and the symptoms usually go away when the wisdom teeth are fully erupted. 2. Wisdom tooth pericoronitis is usually caused by incomplete eruption of wisdom teeth, which usually leads to severe pain in the posterior region, swelling of the gum tissue and other phenomena, and in severe cases, it may even lead to aggravation of the pain of swallowing, and it is recommended to go to the hospital dentist or a professional dental clinic in time for examination and treatment. 3. Gingivitis or periodontitis is generally due to the periodontal tissues by the plaque in the bacterial invasion or food congestion caused, generally cause bad breath, periodontal abscess and other conditions, it is recommended that the application of tetracycline or nitroimidazole under the guidance of the doctor anti-infective treatment, and at the same time, systemic periodontal treatment, including scaling, scraping. The last side of the teeth swollen meat, can go to the hospital in time, follow the doctor’s instructions reasonable treatment, the use of drugs need to follow the doctor’s instructions.