Review (1/5): Very disappointed
I purchased this after doing quite a bit of research on which charcoal powder to get and am very disappointed. After using it for a week straight while following the instructions, I have seen no changes on my teeth becoming whiter. It is also a mess for the sink and in your mouth. It takes at least 10 rinses to get all the charcoal out. Even then, you will be spitting black out for a while. To help get the charcoal out, I would have to brush my teeth with regular toothpaste afterwards and floss after instead of before. Just a little tip!
PS, I have tried a couple other cheaper brands and have seen whiter teeth after just one use...and the charcoal powder was a lot easier to rinse.