A liquid dispensing nozzle having an opening, a removable cap, a residual liquid evaporation path between the opening and the exterior of the nozzle, an element for blocking the evaporation path, mobile in the cap between a blocking position and a position opening the evaporation path, the cap including an exterior envelope and an interior envelope that are coaxial, and mobile relative to one another in an axial direction between: a storage configuration; a configuration for unscrewing the cap when a bearing force exerted on the cap has an intensity greater than a predetermined threshold; a safety configuration if a bearing force exerted on the cap has an intensity lower than the predetermined threshold or if no bearing force is exerted on the cap, the blocking element being configured to be driven by the movement of the exterior envelope to pass from the blocking position to the opening position.