According to typical inventive practice, precursor particulate is pressed andor caste andor molded andor machined, thereby producing a porous green body of a desired shape. If the switch voltage is higher than the reference voltage, the switch is determined to be in a first state. The membrane may be installed in a lightweight basin as a liner resulting in improved ease of still manufacturing and assembly as well as improved sealing. The sensor waveguide receives the light signal from the input waveguide. The spherical hinged joint controls the valve to discharge toothpaste in the toothpaste container into the pipe channel and the toothbrush head. Opposed open ends of the tube abut opposed surfaces of the ring lip.