All my life, I was 'blessed' with yellow looking teeth. in fact, for years my family dentist informed me to don't even bother with any of those teeth whitening products or professional treatments (even at his own office; costing over $600 for a complete session and lasting only a few months). his explanation was because I had inherented yellow teeth from the get go, these commercial products and treatment options would at best, only make my teeth appear LESS yellow, but never white per se. So, given this doomsday scenario, I didn't bother with any whitning products or services for the next 20 years. I mean, why bother, right?? Why pay big $$$s to have LESS yellow teeth? So, fast forward now to about (2) two weeks ago, around XMAS 2008. While shopping with a friend, we accidentally "paid" for our friend's bottle of Listerine Whitening Pre-Brush rinse. Instead of returning the product back to our friend, I thought, "easy whiter teeth. yeah, right. more marketing crap here. But I also wondered aloud, hum, what the heck, it's only $7.00. Why not give it try." I also read the instructions and product guidance on the back of the bottle where it stated that I should see results by 120 days of continued use (results vary by individual of course). Folks, like every sane person out there, I've always been rather skeptical of marketing gimmicks and advertising claims. And certainly, this product was no exception. But, man, was I in for the most surprising shock of my life!! I've been using this product for a little more than 2 weeks now, while adhering to their recommended twice a day regime of 3 teaspoonful solution per session. My once deeply yellow and tea stained teeth (even with regular dental cleaning)is now noticeably LESS yellow, in fact, appearing borderline white (dare I use this word to describe my smile now!!!) and nearly free of all unsightly tea stains. In only two (2) short weeks folks - never mind that 120-days period suggested for possible improvement on the back of the bottle!! Needless to say, I was completely blown away!!!! Two weeks folks!!! AMAZING!!! Admittedly, the overall taste of the product isn't exactly like downing a smooth glass of vintage Napoleon Cognac VSOP, but it's certainly very tolerable and not bad overall. Moreover, so far, I've experienced NO other oral or mouth issues as a result of my continued product use (unlike some other users). Before accidentally stumbling upon this product, I was a bit self conscious whenever I smile - because of my less-than-perfect pearly whites of course. But now, I find myself smiling with more confidence and freedom than ever!! I honestly can't imagine how much more improvement could be had with another full month or so of continued use (I'm content with the immprovement already!). Simply amazing product, folks! Also, I might add that the foaming effect really helps to make your mouth feel very clean and fresh, before brushing. In summary, the Listerine Whitening Pre-Brush Rinse is a winner and has made a shocking believer out of me. Try it yourself and who knows? You just might enjoy similar fantastic results and immprovement. Congrats Listerine for putting out a great product at a very reasonable price also. BEST REGARDS