Multi-choice problem: Choose from the options at the end, and answer how do you do this: How do I use baking soda to whiten my teeth?

Pick your answer from: 1. 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.. 2. 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..
1.