An application device applies an active agent to a fibrous material. The application device has a housing defining a storage volume which is arranged in the housing and is intended for storing the active agent, and an applicator. By the applicator, the active agent located in an application volume is applied to the material. In order to make reliable and straightforward application possible, the applicator has an application volume, a number of hollow teeth which are arranged in a comb-like manner and have an upper wall and a lower wall, between which at least part of the application volume is arranged, and also gaps which are located between the teeth and are intended for introducing the material into the application volume.