Prof. Weihua Guo has been leading his research group in the fields of illustrating the phenomena and mechanisms of tooth development, understanding and applying the odontogenic stem cells to all kinds of clinical diseases that might be targeted and cured by/with them, constructing the treated dentin matrix (TDM)-based bio-root and conducting its application trials in big animal experiments, and the prevention and treatment exploration of children and adolescents’ malocclusion. E-mail: guoweihua943019@163.com.