Please choose the correct solution to the question: How to remove stains from teeth

Solution1: 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.

Solution2: 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 format: solution1/solution2
Answer: solution2