Edwina Kidd is Emerita Professor of Cariology at King's College, London. She qualified at the Royal Dental Hospital, London, in 1967. Although she was a teacher of Conservative Dentistry, her research interests have been in cariology. She has published extensively in research journals and lectured worldwide. She is author of Essentials of Dental Caries, editions of Pickard's Manual of Operative Dentistry (Oxford University Press) and is co-editor of Dental Caries (Wiley-Blackwell) with Ole Fejerskov and Bente Nyvad. Her principal aim in teaching and writing has been to base the practice of Conservative Dentistry on the science of Cariology. Ole Fejerskov is Emeritus Professor at Institute of Biomedicine, Aarhus University. Professor Fejerskov has completed honorary Doctoral degrees at universities in Göteborg, Oslo, Oulo, Montpellier, Beijing, Chengdu and Shanghai. He has been Professor and chair of the Department of Dental Pathology, Operative Dentistry and Endodontics at the Royal Dental College Aarhus for 20 years, and Dean for over 8 years. Ole Fejerskov has written and edited 10 international books, and over 400 papers on dental caries and fluorides, and was editor-in-chief of Community Dentistry and Oral Epidemiology, an international dental journal, for 10 years. He is also a visiting professor in France, Australia, Japan and Singapore, and has completed extensive epidemiological studies on oral health in East Africa, and China.