A toothbrush for the treatment of tooth sensitivity is disclosed. A direct oxidation fuel cell includes one or more electricity generators which have a membrane-electrode assembly and anode and cathode members disposed in close contact with respective sides of the membrane-electrode assembly interposed therebetween in order to generate electrical energy and water by a reaction of a fuel and oxygen. The signal can be coupled to eliminate offset shifts due to component mismatches, calibration, aging andor temperature associated with the sensor device.