Periodontal surgery is generally performed after 2-3 months of basic treatment, followed by a comprehensive examination of the oral condition, including some periodontal pocket x-rays for a thorough evaluation, and if a very good healing condition is still not achieved, then periodontal surgery can be considered. The basic periodontal treatment includes full mouth scaling and subgingival scaling, after these two are done, most of the local irritants on and under the gingiva are basically removed, at this time 2-3 months later, if the depth of the periodontal pocket is still ≥5mm, and there are also irregularities in the shape of the subgingival pocket and alveolar bone, these cases can be subjected to periodontal surgery; there are also some lesions such as root bifurcation, which can be Periodontal surgery can be performed to reduce its height and make the periodontium easy to clean.