An apparatus including a first electrode; a second electrode; a first and second ceramic material disposed between the first electrode and the second electrode, the second ceramic material having a greater electrical conductivity than the first ceramic material. The method of the present invention includes the step of grinding bristles, which have been set in a head part of a toothbrush, using a grinder provided with protrusions having heights ranging from 1. The phases may begin execution upon completion of the target phases. A static housing receives the first and second seal elements and engages the static surface to provide a static stationary seal, while concomitantly providing a flex region that engages the seal elements to form a dynamic seal therewith. The package can have a first position in which first and second planar regions of the backing layer are substantially in plane with one another.