Abstract: A toothbrush-demonstration device and system. The device has a main body and comprising a plurality of toothbrush holders, each of the toothbrush holders being structured and configured to accept and removably secure therein a single toothbrush in a fixed position, the toothbrush comprising a handle and a head including a plurality of cleaning elements, wherein a plurality of toothbrushes can be securely mounted substantially parallel to one another in the plurality of toothbrush holders for a simultaneous movement with the device relative to a test surface. The system includes the device, two toothbrushes being compared, and a test surface.