Soften and Get Rid of Tough Calluses: blend two tablespoons of baking soda in a basin of warm water and add a few drops of lavender oil. After a nice long soak, scrub them away using three parts baking soda, one part water, and one part brown sugar.
My dentist actually told me about this. Use a little toothpaste, mix in one teaspoon baking soda plus one teaspoon of hydrogen peroxide, half a teaspoon water. Thoroughly mix then brush your teeth for two minutes. Remember to do i