There are several reasons for a meatball growing behind the tooth: First, it may be due to a new tooth erupting, and when it is about to erupt, the gums will swell, and it will appear like a meatball, which needs to be diagnosed by taking a film to check the back of the tooth, and if there is a tooth about to erupt under the gums, it can be diagnosed as a new tooth about to erupt. Second, a meatball behind the tooth may also be the phenomenon of gingival tumor, when the gums are stimulated by dental calculus, it is easy to produce gingival tumor, or it may be due to its own physique, resulting in the phenomenon of gingival tumor. Third, there is a meatball behind the tooth, there may also be due to periodontal abscess or the emergence of periapical abscess, spreading to the back of the tooth, generally need to take a film to check whether there is inflammation in the apical part of the tooth, or periodontal periodontal membrane widening phenomenon, this need first anti-inflammatory treatment, and then according to the condition to target the diagnosis and treatment.