Taiwan Academy of Periodontology has compiled a complete list of criteria addressing the issue of peri-implant mucositis. It includes the following: introduction, clinical diagnosis, goal of treatment, consideration in treatment, assessment of outcomes, treatment options and explanations, domestic and foreign literatures. The responsibility of a dentist is to perform a thorough examination and inform the patient of the disease conditions, method of treatment, prognosis, and the symptoms that may arise if no treatment is performed. By discussing the above, the most suitable treatment plan can be derived.