A gray scale image cleaning algorithm for improved check code line OCR. The membranes serve to aid cleaning of the teeth and to polish the teeth surfaces during use of the toothbrush. A secure communications device is connected to the at least one communications sensor and to a data source external to the cabinet for transferring secure data to and from the at least one communications sensor. A projection is provided on the second connecting surface at a position of projection of the lock arm and has a second blocking surface facing a first blocking surface of the fitting. An oxygen-containing gas is made to pass through the cathode chamber.