A fluid or powdery product dispensing device comprising a dispensing head (1) provided with a dispensing opening (10), an air flushing system (20) for generating an air flow when the device is actuated, and at least one reservoir (30) containing a single dose of product, said reservoir (30) comprising an air inlet (31) linked to said air flushing system (20) and a product outlet (32) linked to said dispensing opening (10), said reservoir (30) being mounted removably on said air flushing system (20), such that, after the device has been actuated, the empty reservoir can be removed from said air flushing system and replaced with a new full reservoir, said air flushing system (20) being designed to return to the idle position in order to allow the device to be actuated again with said new full reservoir, said air inlet (31) being sealed by a first closing element (40) and said product outlet (32) being sealed by a second closing element (50), said device comprising a mechanical opening system (61, 62) cooperating with said first and second closing elements (40, 50) in order to mechanically expel each from the respective sealing position of same during the actuation of the device, said mechanical opening system comprising a first rod (61) secured to said air flushing system (20) and a second rod (62) secured to said dispensing head (1), said first and second rods (61, 62) each cooperating, during actuation, with a respective closing element (40, 50), in order to mechanically expel it from the sealing position of same.Dispositif de distribution de produit fluide ou pulvérulent comportant une tête de distribution (1) pourvue d'une ouverture de distribution (10), une chasse d'air (20) pour générer un écoulement d'air lors de l'actionnement du dispositif, et au moins un réservoir (30) contenant une dose unique de produit, ledit réservoir (30) comportant une entrée d'air (31) reliée à ladite chasse d'air (20) et une sortie de produit (32) reliée à ladite ouverture de distrib
