this review title is: did not work and the content is: wife has a light plaque on the back of her front lower teeth this thing just vibrates in place after minutes nothing changed this thing does not have enough power to make a difference i can not understand how it has good reviews but this is our experience with this product that we are sending back.there are other information for this review, one is this reviewer did purchase it and the other is 3 people think this review is helpful.