A device isolation film has a first height in a first area and a second height higher than the first height in a second area. A test controller is configured and arranged to generate a set of random parameter values for the logic core. With low structured composites, simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces. The processor elements are embodied using CMOSNeuron MOS threshold value logic or using CMOSNMOS pass transistor logic. The invention can include a power supply substrate that is arranged separately from the flexible substrate having a driver, so that the noise of the driving voltage supplied from the power supply substrate is reduced.