Mitsui Dental Clinic is a locally rooted dental specialty medical facility located in Koga City, Ibaraki Prefecture. The clinic is led by Director Masaaki Mitsui and provides comprehensive oral care with a focus on general dentistry. Operating hours are from 9:00 AM to 12:00 PM in the morning, with afternoon hours from 2:00 PM to 7:00 PM on weekdays and 2:00 PM to 6:00 PM on Saturdays, making it easily accessible for working individuals and students. The last reception is at 11:30 AM for morning sessions and 6:00 PM for afternoon sessions, allowing patients to visit with flexibility. The clinic is closed on Thursdays, Sundays, and public holidays, with additional closures during the year-end period (December 29 to January 4) and summer vacation (August 10 to 16). English language support is available, making it accessible for non-Japanese speakers. The clinic also provides parking facilities for convenient access by car. Additionally, the clinic collaborates with medical doctors for sleep apnea treatment, demonstrating a comprehensive approach to health management that extends beyond traditional dental care.