I use crest white strips once per year. These are by far my favorite out of even the more expensive ones. Last year I did the $60-$70 dollar strips thinking they would work the best and for some reason these less expensive strips have always worked the best for me! A few years ago I used these exact ones and got these amazing results the same as this time. Top pic is before (red wine drinker), the middle is after the times using them, bottom is half way through (cut out red wine as well). These results don't lie. Get these you will not be sorry. I don't brush my teeth first FYI, too much sensitivity. And I leave them on 35-40 min each time.
