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A device for oral application of a substance, comprising an inner tube surrounding a first volume an outer tube surrounding a second volume, the second volume comprising a cavity section adjoining an inlet opening of the outer tube being adapted for containing the substance, a separation area arrang

A device for oral application of a substance, comprising an inner tube surrounding a first volume an outer tube surrounding a second volume, the second volume comprising a cavity section adjoining an inlet opening of the outer tube being adapted for containing the substance, a separation area arranged in the second volume, the separation area adjoining the cavity section and the first volume, and a selective connecting passage between the cavity section and a pressure compensation space to selectively enable a flow of the substance from the cavity section though the first volume. A kit-of-parts, comprises the inventive device a predefined amount of a substance being contained in a receptacle or the cavity section, and instructions for the use of the substance. Methods for filling the inventive device as well as to a method for oral application using the inventive device are provided.

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1. A dosing device for administering doses of a free-flowing composition together with a free-flowing carrier medium, comprising: a storage chamber for the composition, said storage chamber communicating with a surroundings via at least one inlet opening;a plunger tube that is disposed in the storag

1. A dosing device for administering doses of a free-flowing composition together with a free-flowing carrier medium, comprising: a storage chamber for the composition, said storage chamber communicating with a surroundings via at least one inlet opening;a plunger tube that is disposed in the storage chamber for sealed displacement between a rest position in which the plunger tube is completely inserted in the storage chamber, and a dosing position in which the plunger tube is removed from the storage chamber along a path that corresponds to a desired amount of the composition to be dispensed, wherein the plunger tube is hollow and opens a fluid connection between a through-opening arranged between the storage chamber and an inside of the plunger tube; anda suction opening disposed at a free end of the plunger tube, said free end projecting out of the storage chamber, wherein a one-way valve is disposed in the through-opening, the one-way valve opening a fluid path from the storage chamber into the inside of the plunger tube and shuts off said fluid path in the opposite direction, and wherein moving the plunger from the rest position to the dosing position provides a pressure in the storage chamber which is lower than a pressure of the surroundings so that the free-flowing composition present in the surroundings flows through the inlet and into the storage chamber, and the free-flowing composition in the storage chamber can be dosed through the fluid connection and suction opening. 2. The dosing device according to claim 1, wherein the one-way valve is composed of an elastic plastic material. 3. The dosing device according to claim 2, wherein the one-way valve is unitary. 4. The dosing device according to claim 2, wherein the one-way valve has a through-slit between two elastic walls that bear against one another whilst forming a defined angle between each other. 5. The dosing device according to claim 4, wherein the elastic walls have a thickness of between 0.3 and 0.6 mm. 6. The dosing device according to claim 4, wherein the through-slit has a length of between 2 and 5 mm. 7. The dosing device according to claim 1, wherein the one-way valve is integrally connected to the plunger tube.