I got suckerd out of 23 bucks! Crest White Strips are not a flimsey strip of plastic as the t.v. ad misleads you into thinking. They are a soft delicate paper strip that desolves very fast on your teeth. If you don't get it on correctly the first time, you pretty much ruined it and it's effectivness. When i tried putting it on, i kept getting it crooked or on too much to the left or to the right, thus i had to throw it away because it became damaged and twisted up. If by chance you do get it on right, It causes you to foam at the mouth like a Pit Bull with rabies for 30 minutes. And you have to put up with this more then once a day for (supposed) results. Do yourself a favor and save up for the dentist to have some bleach trays made. You'll get better results with less hassle. Crest White Strips are a complete headache and thats the bottem line. Don't throw your money away like i did. - B.A.R