I have tried many products that promise white teeth. Many of them cost at least $50 or more but Listerine Whitening Strips are only around $14-$15. They are great because they are absolutely mess free, they simply dissolve in about 10-15 minutes. You can literally walk around with them on and not feel strange. After and while they dissolve they leave a fresh taste of Listerine in your mouth as well which is always nice! Also, I did not experience any tooth sensitivity while using them which with other products I usually do. I would definitely recommend trying them if you haven’t already it is well worth the small cost. They may not be as potent as some, but for me they worked great!