Review (1/5): NO WHITE TEETH, Makes a mess and makes teeth sensitive in two brushings only!  Waste of money!!!
I have to agree with the people who said it doesn't whiten and that it left sensitivity. Fortunately I only used it about three times, so no broken or chipped crowns. A lot of people said it really whitened, so I am thinking perhaps my teeth weren't as badly discolored as theirs. Any product that makes my teeth more sensitive after two brushings is not worth the potential brightening to me. I had to rebrush AND floss my teeth to get rid of the black the charcoal left.