Review (1/5): Didn't whiten my teeth at all
Used daily for over a month and didn't notice any whitening at all. Plus it's very messy, and overpriced. I can't recommend this product. After giving up on Magic Mud I decided to get an [[ASIN:B009DNE268 Emmi-dent 6 100% Ultrasonic Toothbrush]] and within a couple of weeks my teeth were noticeably whiter.
If you do wish to try this type of tooth powder, there are now other companies that sell similar products for much cheaper. Maybe activated charcoal will whiten your smile, but it didn't do anything for mine.