Device for treating human keratin materials, in particular using an electric current, comprising at least: - a reservoir containing a composition, in particular cosmetic or dermatological, to be applied to keratin materials, - a component for distributing the composition contained in the reservoir, in particular a pump, a nozzle (2) for applying the composition contained in the reservoir, comprising at least one application member (6), in particular a plurality of application members (6) , the applicator member (6) being received in a housing supplied with composition from the reservoir by the dispenser member, the applicator member being movable in its housing under the pressure of the composition between a first position and a second position, at least one intermediate storage chamber for the composition being delimited by the bottom of the housing and the applicator member, the volume of the intermediate chamber varying when the member has pplication moves from its first position to its second position.
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