Professor Ngo has extensive experience in private practice, research and education. For two decades, he was the principal of a dental practice located in the business district of Adelaide. He has maintained regular clinical sessions treating patients with advanced caries and erosion. As an educator, 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. Over the last 15 years, he has been very active as an international speaker and have contributed 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. He was invited to the University of Queensland as Professor and Chair of General Dental Practice in 2009. In 2012, he joined the University of Kuwait as Professor of the department of General Dental Practice and Director of Comprehensive Dental Care. In 2016, he joined the University of Sharjah, United Arab Emirates, as Dean of its Faculty of Dental Medicine and Executive Director of the University Dental Hospital Sharjah. He is currently Dean of the University of Western Australia Dental School, Director of the Oral Health Centre Western Australia and serving in the State Oral Health Council of Western Australia. He has been a technical consultant to several dental organisations and was co-inventor of several dental products.