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I bought a tube of this from WalMart for about $7 (just the tube, not the kit) and I LOVE THIS STUFF! I have a top teeth retainer from when I had braces, so I just dry my teeth with a towel something, use a q-tip and put it on my teeth, then put the retainer overtop. I did this twice a day for 2 weeks, and my top teeth are so much whiter than my bottom teeth. I left it on for like 15 minutes each time. I tried boiling a hockey mouth guard to make a retainer thing for my bottom teeth, but it didn`t work.. oh well, people only see the top teeth right! <br /><br />PROS: <br />Easy to Use<br />Cheap<br />It works!<br />No tingly sensation<br />Don`t need to keep using it for more than 2 weeks, (though I do it once every couple of days)<br /><br />CONS: <br />Takes at least a week to see a noticeable difference<br />Have to do it twice a day for the first 2 weeks to see a big difference<br />The Kit wasn`t available at my store (comes with a retainer I believe)<br /><br />Overall I`d rate this 5 Stars, and I totally recommend it!<br /><br />