Niekawa Dental Clinic is a dental practice located in Kita-Shinjuku, Shinjuku-ku, Tokyo, conveniently opened just a 2-minute walk from the JR Okubo Station North Exit. Since opening in October 1998, the clinic has continued to provide care primarily for local residents and patients referred from nearby medical institutions. Under the direction of Director Katsuyoshi Niekawa, the clinic is characterized by its emphasis on careful explanations and treatment policies tailored to patients' wishes. The clinic offers a wide range of dental services including cavity treatment, periodontal care, dentures, and implants, with implant treatment available since 2007. From November 2025, office whitening has been introduced, enabling short-duration aesthetic dental care within the clinic. For patients who have difficulty visiting the clinic, home visit dentistry is also available, providing dental care at patients' homes. Payment methods include credit cards and electronic payment (PayPay), and barrier-free facilities are equipped. The clinic operates on Mondays, Tuesdays, Wednesdays, Fridays, and Saturdays, with Saturday hours extending until 5:00 PM, making it easily accessible for those who find it difficult to visit on weekdays.