They really have these things, musical toothbrushes, only not quite as advanced as the one pictured. I use a small toothbrush to clean pen nibs and the one I've been using is called a Firefly toothbrush. You squeeze the handle and it lights up and blinks for one minute, so you know just how long to brush your teeth. These things might be aimed at children or at people who use them to clean pen nibs, I'm not sure which.
