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Prevention has always been present with health care providers, taking into account the evolutions both of individuals and society in order to respond to the imperatives of the moment (administrative, economic, legal) etc.). Key moments in our recent history model and structure these evolutions. Between individual evolutions and interactions with the collective, prevention is gradually becoming pertinent in an approach where ethics and technique make it possible to find the most helpful postures and levers to stimulate the desire to be part of a dynamic of changing behaviours favourable to prevention.