In the field of periodontics, periodontal support therapy has proven to be essential in preventing the incidence or recurrence of periodontal diseases. The protocol is designed according to the risk profile of a patient. For example, in the presence of the history of periodontal therapy, subgingival microbiota containing large numbers of spirochetes and mobile rods can recolonize pockets 4-8 weeks after scaling. Similarly, routine maintenance of dental implants has been recommended to prudently avoid peri-implant inflammation, Indeed, the understanding of the nature of the tissue around the implant and its pattern of disease would be important to consider, even surpassing importance. Recently, a systematic review by our group has identified the importance of maintenance therapy around implants because it can help prevent about 3 times patient-level frequency peri-implantitis.