A fluid or powdery product dispensing device comprises a dispensing outlet (10), an air ejector (20) to generate an air flow when the device is actuated, and at least one réservoir (30) containing a unit dose of the product, the réservoir comprising an air intet (3 1) and a product outlet (32) closed by a closing élément (50), the device comprising a mechanical opening System (61, 62) to eject the closing élément mechanically from its closing position, the réservoir being removably mounted on the air ejector, such that after the device has been actuated, the empty réservoir can be removed from the air ejector and replaced by a new, full reservoir, the air ejector being brought back to the rest position when the empty réservoir is replaced by the full réservoir.
