I have tried many tooth whitening systems in the past, most of which involved messing films or trays. Listerine Whitening Quick Dissolving Strips is by far the most convenient tooth whitening product I have tried. The strips were easy to put on my teeth, and did not leave any mess at all. A little but of film remained undissolved, but with a quick swipe of the tongue the problem was fixed. Unlike the other products I tried, the quick dissolving strips had only a slight minty taste, while other products have tasted like harsh chemicals and made it so I did not want to use them daily. After only one time I saw my teeth get slightly whiter, and each time afterwords. I was worried that the price to pay for this convenience would be a not as effective product, but my teeth are now pearly white and I couldn't be happer.