A pile of flesh behind the last big tooth is considered to be caused by various factors such as apical periodontitis, periodontal abscess, hyperplastic gingivitis, and blocked wisdom teeth. 1. Apical periodontitis: If the last big tooth is decayed and causes apical periodontitis, the inflammatory material accumulates in the apical area, accumulating to a certain extent to form an abscess to the mucous membrane side of the breakthrough, thus forming a granulation fistula on the surface of the gums, which needs to be eliminated by endodontic treatment after radiography and examination in the hospital. 2. Periodontal abscess: the last big teeth due to the position of the most back, cleaning difficulty, easy to cause the accumulation of dental calculus and thus the formation of periodontitis, periodontal pockets within the accumulation of inflammatory substances leading to periodontal abscess, making the gums swollen and protruding, need to cooperate with periodontal treatment as well as oral anti-inflammatory drugs to eliminate. 3. Hyperplastic gingivitis: plaque, calculus, and medications and other irritants cause hyperplastic inflammation of the gums, resulting in the formation of a pile of flesh, which needs to be cleaned to remove the irritant factors in order to slowly eliminate. 4. Obstructed Wisdom Teeth: If the last big tooth is not a wisdom tooth, and there is a pile of flesh behind the big tooth, it is possible that the wisdom tooth has a proximal and horizontal obstruction state, resulting in the inability to fully erupt, the appearance of the formation of the flesh of the phenomenon of the bulge, you need to take a panoramic film to confirm the diagnosis, and timely extraction of the wisdom tooth.