I'm already on my second tube of this...and let me tell you, it has been a GOD SEND! This is the most AMAZING whitening product I have ever come across. I found out about this while I was watching Kandee Johnson on YouTube and she has really white teeth so I looked into it.
I had kind of a hard time finding this because Wal Mart didn't sell it and neither did Target. Wal Greens sold it (that's where I purchased my kit) and I believe CVS does, but I don't live near one. There's also Bartell's & Drugs & Fred Meyer in Washington that sell it. Anyways, I got mine for 10.99, the box came with a little coupon that saved me $2 on the original price.
I am in love with this stuff! I've used it twice a day for almost two weeks now and I haven't dealt with ANY teeth sensitivity whatsoever. I used to use Crest Whitening Strips, the Pro, Enamel Safe Formula, etc and they always made my teeth SUPER sensitive so I ended up stopping because I hated the way it made me teeth feel. It did get them a little whiter but I used my Crest Strips for a month and I've used this 2 weeks and the results are 100 times better! AND IT'S CHEAPER!
I also found that when you use the little mouth tray it comes with, you can use it sparingly. I put WAY too much into the little tray and I was foaming at the mouth like a dog LOL. Also, the tray doesn't entirely cover my front teeth so I put some of the Gel directly on my 2 front teeth and it makes them even whiter. I love this stuff! At first I thought it was a hype, but it really does work great. I normally use it in the shower because it's easier to just brush your teeth and rinse out the mouth tray, but I also use it at night and I just hop onto the computer for 10 minutes and brush my teeth again and Voila! I love this stuff. I would definitely recommend it and now my grandma is using it because my results have been so amazing :)