I used this on my teeth for the first time today. Mixed a tiny bit in with my usual toothpaste (Arm & Hammer Bright & Strong) and brushed as usual with my electric toothbrush. Didn't really notice a difference in the taste of the toothpaste. There was a good bit of dusty mess on the counter after opening it, and some off-putting grey spit while brushing (it's charcoal, what do you expect). Not only did my teeth appear to be whiter and cleaner, but my whole mouth felt so much cleaner. It was like my toothpaste was new and improved. I've tried white strips and other whitening products. As a smoker and frequent drinker of red wine, I was impressed. I will continue to try this stuff and post a future review after using it more than once. I have high hopes for this product. I'll let ya know!