Eh, not impressed
I used this product for two minutes, twice a day for two weeks and didn't see a difference.  Still using it - why waste the $$, but I added Crest whitestrips (30 mins every day) and Listerine teeth whitening mouthwash (swish for two minutes, twice a day after brushing) and now I'm seeing a good difference.  All these high reviews are BS, save your $$ and get regular teeth whitening toothpaste and mouthwash and get the whitestrips, they work.
Rating: 2 stars