Kosei Dental Clinic, located in Hirai, Hinode-machi, Nishitama-gun, Tokyo, is a Ministry of Health, Labour and Welfare-certified dental clinic with enhanced family dentist functions, meeting three standards: specialization, hygiene, and collaboration with other institutions. Due to this certification, insurance applies to preventive procedures, enabling continuous oral health management. Clinical training supervisor physicians are on staff, providing guidance to medical students and clinical residents while constantly learning the latest medical information. Hygiene management and infection control are thoroughly implemented, with all treatment instruments sterilized after use and air purifiers installed in treatment and waiting rooms. When advanced equipment is needed, referrals to university hospitals or specialized medical facilities are possible, and the clinic collaborates with numerous medical institutions to exchange information and opinions. English language support is available, and credit cards and electronic payments can be used. Parking and barrier-free facilities are fully equipped.