A sudden piece of flesh in the innermost part of the tooth can buckle up may be due to redness and swelling caused by pericoronitis of the wisdom tooth, gingivitis, periapical abscess and other causes. 1. As wisdom teeth do not always erupt completely during the process of eruption, there will be blind pockets around the wisdom teeth, which are prone to accumulate bacterial food debris leading to inflammation, redness and swelling, which may lead to pain. 2. Due to oral hygiene is not clean, can not be good brushing and flossing, which leads to an increase in calculus gingivitis, which leads to gingival enlargement, toughened texture, deep red color, may appear brushing bleeding and other symptoms. 3. If the periapical area of the last tooth is infected, it can lead to the appearance of periapical pus, pus inside the pus, a fluctuating sensation when pressed, and throbbing pain and other symptoms may occur. The sudden lifting of the innermost flesh of the tooth may be a physiological phenomenon, or it may be a symptom of certain diseases, such as wisdom tooth pericoronitis, gingivitis, periapical abscess and so on.