It works if you stick with it
My teeth have always been white by most people's standards, but I drink a lot of tea, so they are not "perfectly white".  This product does indeed seem to make my teeth whiter, but the change was very gradual, and wasn't noticeable until after using the product for six weeks or so.  I only use it once a day with my favorite baking soda & peroxide toothpaste and I'm very happy with the results.  I highly recommend this product, just don't give up on it until you've given it two months to show results.
Rating: 5 stars