Review (4/5): Effective
This product is quite effective and easy to use. Obviously not as effective as going to the dentist, but it removes coffee/tea/soda stains after a few uses.
The only downside is the polisher end is too short to use for the back of your teeth. This includes the back of your front teeth as well as your molars.
Great product if you're looking for cosmetic reasons and don't like whiteners, though. I am pleased with it.