Add coconut oil into a small glass jar and place the jar in a shallow pot of boiling water. Once coconut oil is melted, turn off heat.
Add baking soda and stir to combine.
Add bentonite clay (if using) and stir to combine.
Add arrowroot or cornstarch and stir to combine.
Add essential oils, if using, stir to combine and place jar in the refrigerator.
Stir frequently (every 10 minutes or so) to prevent oil separation.
Add a lid and store in your bathroom. Use your fingers and apply as you would normal deodorant.