The invention relates to a method for producing amido-zinc halides as adducts with alkali-metal halides in aprotic organic solvents, in which a) a primary or secondary amine dissolved in an aprotic organic solvent is provided, b) a lithium base is added in a metered manner, and c) a ZnY2 is subsequently added. A lancing element is rapidly inserted into a body part in a forward phase and retracted quickly to a lesser puncturing depth. Toothbrush configurations of ultrasonically enhanced manually operated toothbrushes and motorized toothbrushes having lateral direction sonic frequency vibrating brush heads emitting ultrasonic energy are disclosed. In a preferred embodiment, the second router performs admission control for the upstream link only if the second router is a receiving edge router for the flow.