How do I use The Dirt's Toothpowder? Support August 11, 2015 21:46 Follow Wet your toothbrush and tap off excess water. Dip in your jar of toothpowder and swirl around. Tap brush on side of jar to get rid of extra powder. Brush as normal! No need to be rough, this stuff really works well! Related articles Is the toothpowder OK for children? Comments 0 comments Article is closed for comments.