Very good, but messy, if not careful.
This is a very good overall tooth whitener and toothpaste. It doesn't taste bad. But it IS messy! You need to be very careful when you spit it out and when you wash the toothbrush. Otherwise, you'll be washing charcoal out of your entire sink! I also found that I needed to brush my teeth briefly, after I had used it, because rinsing my mouth out with water was insufficient to remove charcoal from the gum line. I have very healthy gums -- this just seems to be a place that the charcoal gathers when used.<br /><br />When all this is addressed, it's an excellent toothpaste that DOES whiten! And it reaches places that whitening strips are not addressing!
Rating: 4 stars