Abstract: The invention presented here refers to an appliance (1) for the rinsing of nasal cavities and of paranasal sinuses, with a rinsing mixture (3) and with a vessel (2) for containing and letting flow out the rinsing mixture (3) without overpressure, whereby the appliance (1) has an applicator (4) with an applicator aperture (42) for introducing the rinsing mixture (3) into a nostril, applicator (4) and vessel (2) are connected to one another, applicator (4) and vessel (2) are arranged at an angle of inclination (&agr;) to one another, a rinsing sure level (30) in the vessel (2) is on the height contour of the applicator aperture (42) and the rinsing mixture (3) through the applicator aperture (42) can flow into a nostril and through paranasal sinuses, as soon as the level of the rinsing mixture (30) is on the height contour of the paranasal sinuses.