Following two decades as the principal of a dental practice located in Adelaide, Professor Hien Chi Ngo has maintained regular clinical sessions treating patients with advanced caries and erosion while practicing as an educator, in which role he has published and lectured extensively on dental materials, minimal intervention dentistry and clinical cariology. He serves on the editorial boards of several dental journals, and over the last 15 years, he has been very active as an international speaker, contributing to numerous major international meetings. In research, he is active in the areas of dental materials and cariology, and his current focus revolves around the clinical management of caries, especially in the elderly and medically compromised patients and the interactions between glass-ionomers and the oral environment, and silver diamine fluoride. Prof. Ngo has been a technical consultant to several dental organisations and is the co-inventor of several dental products.