I ordered this the first time and did not see any noticeable change in my tooth color over five uses. However, I DID notice an increased sensitivity in my teeth every time I used it. Thirty days after I received the first kit I received another and an additional charge on my credit card. READ THE ENTIRE TERMS AND CONDITIONS. Item 19 says this is a subscription. They will keep sending you kits until you call them and ask them to stop. I'm not sure why anyone needs additional kits unless you want to outfit all your friends with these bogus gadgets.
Bottom Line: No, I would not recommend this to a friend
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