The objective of this study was to compare the impact on knowledge and counseling skills of face-to-face and Internetbased oral health training programs on medical students. Participants consisted of 148 (82 percent) of the 180 invited students attending their ifth academic year at the Faculty of Medicine, University of São Paulo, Brasil, in 2007. The interventions took place during a three-month training period in the clinical Center for Health Promotion, which comprised part of a clerkship in Internal Medicine. The students were divided into four groups: 1) Control Group (Control), with basic intervention; 2) Brochure Group (Br), with basic intervention plus complete brochure with oral health themes; 3) Cybertutor Group (Cy), with basic intervention plus access to an Internet-based training program about oral health themes; and 4) Cybertutor + Contact Group (Cy+C), the same as Cy plus brief proactive contact with a tutor. The impact of these interventions on student knowledge was measured with pre-and post assessments, and student skills in asking and counseling about oral health were assessed with an objective structured clinical examination (OSCE). Multivariate logistic regression models were applied to identify the odds ratios of scoring above Control's medians on the inal assessment and the OSCE. In the results, Cy+C performed signiicantly better than Control on both the inal assessment (OR 9.4; 95% CI 2.7-32.8) and the OSCE (OR 5.6; 95% CI 1.9-16.3) and outperformed all the other groups. The Cy+C group showed the most signiicant increase in knowledge and the best skills in asking and counseling about oral health.Dr. Eskenazi is an ondontologist and collaborator,