Please choose the correct solution to the question: How do I use baking soda to whiten my teeth?

Solution1: Mix 1/4 teaspoon baking soda with a pinch of salt in the palm of your hand.  Moisten toothbrush with warm water and press it into the mixture to apply some to the bristles.  Gently brush teeth and rinse.

Solution2: Mix 1/4 teaspoon baking soda with a pinch of red pepper in the palm of your hand.  Moisten toothbrush with warm water and press it into the mixture to apply some to the bristles.  Gently brush teeth and rinse.

Answer format: solution1/solution2
Answer: solution1