Review (5/5): Very effective!
My dentist believes this kit is a knock-off because it is supposed to be sold EXCLUSIVELY to dental professionals (who then re-sell it to their patients). I paid my dentist $80.00 for my first kit, which was only 10% hydrogen peroxide. To get 15% AND the whitening toothpaste for $52.00 is a great deal. Best of all, it was very effective.