Powerful product, but a yucky feeling on the teeth
I know...charcoal on the teeth sounds weird.  You're right...it is.  It has a displeasing feel on my teeth, reminds me of the feeling of pages in an old Sears catalog, but it doesn't taste all that bad, and only has to stay on for a little bit.  There's so much in here you could whiten the teeth of the whole neighborhood.  I've heard great things about the power of charcoal...and this is a lot cheaper and healthier than the whitening programs at the dentist.
Rating: 4 stars