The listing, Advanced Crest Whitestrips has ended.
I purchased these to try out because of all the hype, but I could only use a couple of them because they made my teeth sooo sensitive. So I stopped using them and still have 9 strips left out of 14. Each package comes with one top and one bottom strip. I know everyone has different reactions to these whitestrips, so if you haven't tried them before or want to see if they might work for you.. bid bid away :)