In 1983, he opened an orthodontic dental clinic in Matsudo-shi, Chiba prefecture, and in 1988 opened the first lingual orthodontic clinic in Japan in Minato-ku, Tokyo, now in Chiyoda and Matsudo. He is a founding member of the World Society of Lingual Orthodontics and served as chairman (2008-2011) for four years, advancing the lingual orthodontic treatment. He is currently a specialist of the World Society of Lingual Orthodontics and the European Society of Lingual Orthodontics, an adjunct professor of Ferrara University (Italy), and has been an adjunct professor of New York University (USA) and a visiting professor of Hong Kong University in the past. Dr. Takemoto devised the 2001 Lingual straight wire method (LSW), then developed STb light lingual system with Dr. Scuzzo (Italy). They also developed ALIAS Lingual straight wire system which has a square slot. Up to now, his seminar has been held in more than 20 countries, and more than 5,000 orthodontists have participated.