Messy
I was so excited to try this out, I knew it was powder, but didn't connect the dots. Messy is an understatement! If you dip your toothbrush  in the powder, the powder molds ( learned that from another review). So, I sprinkled it in the lid to dip, that makes a mess in the lid. Before you can even get it to your mouth, the black powder flies off your toothbrush ( you wont even see it go) of course, you brush and your mouth and teeth are black. Now, the entire sick is black and the counter. I feel like I spend more time cleaning the sink and counter than I do brushing.  I'm not sure how to fix it, other than use a paste. I am sure it works good, I just do n't like the mess.
Rating: 3 stars