Ditch those pricey whitening strips. Here's a natural and sweet way to whiten your teeth! Ingredients: Strawberries Baking Soda 1. Mash one strawberry with 1/2 teaspoon of baking soda in a small dish or bowl. It will darken in color and get slightly foamy. 2. Use a toothbrush to apply the mixture to your teeth. 3. Rinse the strawberry mixture off of your teeth and then brush them well. Then rinse again. NOTES: - You should only whiten your teeth with strawberries no more than once a week. - You shouldn't leave it longer than 5 minutes. The same malic acid that whitens your teeth can break down the enamel if left on too long.