It actually works quickly!
This product works pretty much as described. Cool thing is it only takes half an hour and I noticed a difference in brightness right away in all my teeth. The only caution given, as I understand it, is not to brush the teeth beforehand. However, it did not get a couple of small corners of coffee stains out between some of my teeth, which was one of the reasons for my trying this product. I'm on my second batch and it still hasn't worked on those areas. Having said that, I can see why most of the users are very impressed, as am I. I still think it would be worth your while to try it if you're looking for a whitening product.
Rating: 4 stars