The past seventy-ive years have witnessed an extraordinary growth of scientiic knowledge related to oral health and the development of evidence-based dentistry. The centrality of prevention to the control of oral diseases and the maintenance of good oral health has become increasingly recognized by the scientiic community, dental educators, dental practitioners, and the public at large. Yet, despite signiicant improvements in the overall oral health of Americans, important disparities exist, and large segments of the population are disproportionately burdened by oral diseases. Despite the proven effectiveness of various preventive modalities, such as luoridation and dental sealants, these have not been universally disseminated and implemented. This