There may be many kinds of periodontal bags, clinically, it is recommended to go to the professional stomatology department for differential diagnosis and symptomatic treatment of the disease, clinically common, relatively speaking, the most common single tooth apical part of the bag, consider apical fistula caused by apical inflammation, that is, itself because of dental caries, further injury to the root tip, root tip further decay, resulting in the corresponding periodontal part of the fistula. The manifestation of fistula in the periodontium is a bag. There is another condition, which is a round and tough nodule between several teeth in the periodontal area, called gingival tumor, which is also manifested as a bag in the periodontal area, and for gingival tumor, it usually requires surgery, and if it needs to be cured, the tooth that causes gingival tumor may also need to be extracted.