The device comprises: a casing (10) having an open end (10′); a composition support (12), that is movable in the casing between a retracted position and an extended position; and an actuator (16) that is suitable for being moved so as to cause the support to move. The device further comprises first and second magnetic elements (20, 22) that are secured to the support and to the casing respectively. When the support is in its retracted position, the magnetic elements generate magnetic forces between them, which magnetic forces are suitable for holding said support in its retracted position. When the actuator is moved, it causes the support to move, moving the magnetic elements apart from each other, thereby reducing the magnetic forces in such a manner as to enable the support to move towards its extended position.