Located in Funamachi, Shinjuku-ku, Tokyo, Hasegawa Dental Clinic supports the oral health of the community as a specialized dental clinic. The clinic's treatment concept is "periodontal treatment as the foundation, minimal removal, and preserving teeth as much as possible," emphasizing long-term tooth preservation rather than simply treating cavities. The clinic begins treatment by carefully listening to patients' concerns and symptoms, aiming to support lifelong oral health. The clinic adopts a system where one attending dentist handles treatment consistently from start to finish, with one dentist exclusively dedicated to one patient during treatment sessions. Multiple patients are never scheduled at overlapping times, and in consideration of privacy, all treatments are conducted in completely private rooms. Appointment times are adjusted in the waiting area so that patients rarely encounter each other, demonstrating meticulous attention to detail. The clinic is also thoroughly committed to preventing hospital-acquired infections, with all instruments used for patients being sterilized and individually packaged. Clinic hours are from 10:00 AM to 7:00 PM (excluding lunch break), and evening hours make it accessible for those who have difficulty visiting during the day. The clinic accepts credit cards and electronic payments, and is equipped with barrier-free facilities, making it easily accessible to a wide range of patients. The clinic is also designated as a partner medical institution for various dental checkups sponsored by Shinjuku-ku.