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I used it for two weeks and could not manage to tell any brightening or whitening of my teeth. It also has a fairly poor taste. If you want to whiten your teeth, a weird and disturbing habit, try your dentist, Crest Whitening strips, or mix a bad of your favorite toothpaste with some baking soda and a bit of water. Those will work. This stuff does not. Besides, really white teeth as silly and unnatural looking.1