It really works . I have always had whiter teeth , I stopped using whitening strips . This is gentle and gives that same result. I get compliments on how white my teeth are . I have recommended this to people. I will continue to purchase this. A little goes along way. It doesn’t stain your teeth or lips only whitens as purple cancels out any yellow tones to give that white smile . As long as you rinse your sink after using it you won’t get any stains on anything. It does stain toothbrush though . If you want whiter teeth I would give this a try , you will notice a difference after a few times using it.