Liquid dispenser for discharging cosmetic products having the following features: a. the liquid dispenser has a liquid store with an outlet connector , and b. the liquid store is filled with a cosmetic or pharmaceutical liquid, and c. the liquid dispenser has a discharge head which is fastened by means of a coupling device to the outlet connector , and d. the discharge head has the coupling device for fastening to the outlet connector of the liquid store , and e. the discharge head has a liquid inlet directed in the direction of the liquid store and has a discharge opening , and f. the discharge head has a pump device for conveying liquid from the liquid inlet to the discharge opening , and g. the discharge head has a ventilation channel which connects external surroundings of the discharge head to an interior of the liquid store , and h. the discharge head has an end surface by means of which a coupled-on liquid store is substantially closed off at the distal end of the outlet connector on the side of the discharge head and which is extended through by the liquid inlet , and i. the end surface and the coupling device are formed integrally as part of a common main component , and j. the end surface has at least one ventilation aperture which is part of the ventilation channel and through which air can flow into the liquid store in an inflow direction , characterized by the following features: k. the at least one ventilation aperture has a minimum clear cross section of at most 3 · 10 -2 mm 2 , preferably of at most 1 · 10 -2 mm 2 , particularly preferably of at most 5 · 10 -3 mm 2 , and 1. the smallest clear diameter of the at least one ventilation aperture is configured such that the hydrostatic pressure that is generated at a maximum by the liquid in the liquid store cannot pass through the ventilation aperture due to the surface tension of the liquid. a. the liquid dispenser has a liquid store with an outlet connector , and b. the liquid store is filled with a cosmetic or pharmaceutical liquid, and c. the liquid dispenser has a discharge head which is fastened by means of a coupling device to the outlet connector , and d. the discharge head has the coupling device for fastening to the outlet connector of the liquid store , and e. the discharge head has a liquid inlet directed in the direction of the liquid store and has a discharge opening , and f. the discharge head has a pump device for conveying liquid from the liquid inlet to the discharge opening , and g. the discharge head has a ventilation channel which connects external surroundings of the discharge head to an interior of the liquid store , and h. the discharge head has an end surface by means of which a coupled-on liquid store is substantially closed off at the distal end of the outlet connector on the side of the discharge head and which is extended through by the liquid inlet , and i. the end surface and the coupling device are formed integrally as part of a common main component , and j. the end surface has at least one ventilation aperture which is part of the ventilation channel and through which air can flow into the liquid store in an inflow direction , k. the at least one ventilation aperture has a minimum clear cross section of at most 3 · 10 -2 mm 2 , preferably of at most 1 · 10 -2 mm 2 , particularly preferably of at most 5 · 10 -3 mm 2 , and 1. the smallest clear diameter of the at least one ventilation aperture is configured such that the hydrostatic pressure that is generated at a maximum by the liquid in the liquid store cannot pass through the ventilation aperture due to the surface tension of the liquid. <EOS>