Dr. Nagai received his DDS from the Osaka Dental University, Japan in 1987, studied at the Harvard School of Dental Medicine as a Clinical Fellow from1989 to 1992 when he practiced at the Massachusetts Veterans Administration Medical Center in 1990 and the Mass. General Hospital in 1991. He received PhD from Tokyo Medical and Dental University in 2016.
Dr. Nagai serves as a board member of the Japanese Society for Laser Dentistry, Asia and Pacific Division of the World Federation for Laser Dentistry, the Laser Education International, the Japanese Academy of Color for Dentistry and the Japan Society for Dental Anti-Aging. Dr.Nagai was the General Secretary of the 2016 WFLD JAPAN. He is a committee member of the Academy of Laser Dentistry, the Japan Academy of Esthetic Dentistry, the Japan Society for Laser Surgery and Medicine and Japan Association of Microscopic Dentistry. He was awarded the Leon Goldman Award for Clinical Excellence in Laser Dentistry in 2010 from the Academy of Laser Dentistry and the Excellent Presentation Prize of the Japanese Academy of Color for Dentistry in 2008. Dr. Nagai maintains a full-time practice in Tokyo, Japan.