The Nitty Gritty Tooth Powder Recipe. It's really not gritty. Ingredients. ¼ cup bentonite clay; 1 tsp-1 T activated charcoal (depending on the whitening power you want); 1 tsp baking soda; 1 tsp diatomaceous earth (or another tsp of baking soda); 2 tsp calcium carbonate powder; 1 tsp ground cinnamon; ½ tsp ground cloves; 1 tsp himalayan salt (finely …