Mix the mineral clay, birch sugar, baking soda and peppermint oil and mix thoroughly. This also works really well in a mortar and pestle.
Add the B12 tablets and grind them super fine with the mortar and pestle. Mine were really hard so it took some time until they were super fine.
Fill into a glass container. If you use your tooth powder, simply wet your toothbrush and dip it into the tooth powder.