It works but...
This does work, but you do have to put some work in and it has its limitations. It is a cheap product (light weight and difficult to get the battery in and secured to turn on). But once it is working, it does work. It works best on the front and side teeth as the head is large and the cup is a bit hard to get in the back of the mouth. It does a good job so will use it on the visible teeth to keep coffee stains down in between bleaching trays.
Rating: 3 stars