we have an electric toothbrush. everyone but marty uses it. everyone who does use it has their own brush head that snaps onto the handle. when you buy a pack of the brushes they come with these little colored rings that slip over the base of each brush so you can tell them apart. inevitably, i always get stuck with the pink marker. it is both embarrassing and appalling how much can be gleaned about my life by that little hot pink ring of plastic.