Question: How to remove stains from teeth

  Options: 
 A. Mix 1 tablespoon of baking soda with 2 tablespoons of water to make a past, brush teeth a few times a week with this paste.
 B. Mix 1 tablespoon of baking soda with 2 tablespoons of hydrogen peroxide to make a past, brush teeth a few times a week with this paste.
Answer: B