Don't waste your money!
This is a poorly designed product.  Once the strips are in your mouth, not only can you not eat, drink, or speak--you cannot even move your tongue!  If it bumps the strip, the strip crinkles, and soon you only have a balled-up piece of plastic stuck to one tooth.  I used over half the box, and only one time did they stay secured the full half hour they are supposed.  Were my teeth whiter?  No.  They just caught the sun better with those little bits of clear plastic stuck in between them.
Rating: 1 stars