This product is fabulous! I have very sensitive teeth, so it's not easy to get a teeth whitener that won't make them hurt really bad. I mean I do also drink a lot of coffee and do enjoy my red wine too. If I hadn't taken a before and after picture, I probably wouldn't have noticed a difference just by going off the sheet, however, there was a huge difference, I mean really noticeable in a side by side photo comparison! So yeah, I totally believe it's worth the money, and I've told a few people so already.
Bottom Line: Yes, I would recommend this to a friend