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Mehmet Oz, MD, Cardiology, answeredBaking soda and strawberries can brighten yellow, stained teeth. Combine one tablespoon baking soda and two crushed strawberries and brush the mixture onto your teeth and then let is sit for a few minutes. Baking soda is a natural abrasive that has been used for ages to clean teeth, while strawberries contain malic acid, a tooth-whitening agent. While effective, this is not a long-term solution. Rinse or brush your teeth following the treatment.