The present invention is a handpiece, directed to an electric toothbrush having a accessory attachable thereon. The present invention is particularly, the operating head is joined to the operating head and a tubular coupling member attachable to the toothbrush handpiece chuck section for driving the operating head is provided on the coupling member and the toothbrush having a coupling profile for coupling by positive engagement with the drive shaft provided in the handpiece, to target accessory for such an electric toothbrush. Furthermore, the present invention also relates to the toothbrush handpiece having a suitable drive shaft for insertion into the accessory insertion shaft by a blind fit. The accessory is particularly may be accessory brush for cleaning the teeth, interdental cleaning device, gum massaging head, or, other accessories instruments for performing the same operations in the oral cavity also are contemplated that. According to one aspect of the present invention, comprise a coupling element axially movable in the longitudinal direction of the accessory on the accessory, and the drive in the direction transverse to the longitudinal direction of the attachment the axial movement it is proposed to change the unlocking or locking movement of the coupling system. This, on the one hand, as well as enabling the coupling is obtained which is resistant to more vibration rigid between the accessories and the toothbrush handpiece, on the other hand, by pushing and pulling away axial movement techniques known connection is possible from being reconfigured been removed. According to the present invention moves, the engagement elements of the binding profile of accessories chuck section movable in the transverse direction, and / or actuation element provided in the coupling member of the accessory in the longitudinal direction of the attachment It is possible, as movement of the actuating element and / or the engaging element in the longitudinal direction of the
