Schools are places where health is promoted, but how should professionals go about intervening? This feature article reviews the current state of knowledge and highlights methodologies and examples of interventions. Also in this issue: interviews with Prof. Jean-Paul Moatti (behavior and prevention) and Laïla Loste (chronic diseases), a survey on sleep, and training for general practitioners in identifying and intervening in alcohol-related issues. In the International section, a presentation of Brazil’s “family health” program and a study on early pregnancy in Brazil. And finally, an analysis of the film “Precious,” which can serve as an educational tool in dialogue with adolescents.