I purchased this product a while back from Fry's Electronics on White Light Smile Reviews an As Seen On TV booth expecting it to just be a waste of $20, but I decided $20 wasn't even comparable to the times i've gotten a whitening procedure at the dentist, so I decided to give it a go. Surprisingly this product does work, don't expect it to whiten your teeth from a tea brown to a hyper white color. The package does say that results will vary, and I saw a definite 3 shade difference from only one 15min session with it. Of course this product could be a little more detailed on what to do, so i'll give you a run down on how I used it and it worked for me and everyone i've recommended it to. First DO NOT expect to be able to walk around or do anything when you are going to do your 15-30 min session with this. (My suggestions for use may seem a bit odd, but they've worked for my friends and family so I wouldn't stray from them.) One obvious flaw with this product is that your saliva will definitely interfere with the process, my recommendation to avoid this and to maximize your whitening is before usage to brush your teeth well and floss. Next I follow with rinsing with just water and then setup your tray with the gel. While setting up the tray I dry out my mouth with a cotton towel (I use a clean dry hand towel) http://drozforskolin.org/white-light-smile-reviews/