They really do work, but there’s one thing that needs to be remembered. You can only get your teeth as white as your teeth’s genetics will allow. But if you do all of the strips you will see a nice improvement. Then I use them here and there a few days before special occasions for a boost. I love them, never had any problems, no sensitivity either.
Judith G. asked, “Do they really work ? Do I have to be reusing them with in time to time or one time will do the work ? After the box is finished ? ”