I'm not convinced.
This product is messy, it doesn't come with clear directions on how much to use or how long to brush with it, little particals of black will be left behind even after thorough brushing so you'll have to brush with a paste after. There is no smell or taste to it, which I was apprehensive about it tasting bad, so that's a plus. I've been using it 2X a day for 5 days now and haven't seem much of a different in the whitening.
Rating: 3 stars