It's a simple, manual toothbrush. BUT, it comes with interchangeable little heads with bristles, that can be bought separately. When it's time to change your toothbrush, you just remove the old head and clip on a new one. Which means you keep the handle - the bulk of the toothbrush - for as long as the plastic lasts, and just toss out the head.
Many dentists advise changing toothbrushes every three months. That means 4 toothbrushes a year, per person. Which, in turn, means many, many 24 billion of toothbrushes thrown away each year, which work their way into landfills, or get burned in incinerators (and we breathe them).
Problems which would be drastically reduced, of all of us used a disposable toothbrush like this. So why is it so hard to find?