Director of Stomatology, Chief Physician, and Professor at Peking Union Medical College Hospital. He specializes in painless dental treatment, treatment of dental phobia, and oral endodontics, including complex root canal treatment and periodontal disease treatment. Dr. Wan graduated from Peking University School of Stomatology in 1993 and has been working at Peking Union Medical College Hospital ever since. He is one of the earliest scholars in China to implement painless dental treatment and sedation technology. In 2003, he established the first domestic team for the systematic treatment of 'dental phobia' and founded the 'Painless Dental Treatment Center of Peking Union Medical College Hospital'. He has published 27 papers in this field, served as the editor-in-chief of one monograph, translated one book, participated in compiling one textbook, and led or participated in the formulation of multiple domestic diagnosis and treatment norms and operation guidelines.