How does baking soda make teeth white?

How can a simple mixture of equal parts baking soda and water whiten teeth? Baking soda, also known as sodium bicarbonate, is composed of a chemical compound that makes it a great mild abrasive. It is this same abrasiveness that effectively removes surface stains from your teeth and make them appear whiter. read more

To whiten your teeth with baking soda, mix 1 ⁄ 2 teaspoon (2.5 mL) of baking soda with a few drops of lemon juice or water. Then, spread the mixture over your teeth using your finger or a toothbrush. read more

Additionally, baking soda crystals are softer than enamel and dentine (a tooth's outer layers) and therefore can mechanically scrub off stains without scratching those parts of your smile. This has the effect of making your teeth look brighter [source: Domke]. read more

Baking soda is made up of tiny crystals and has an abrasive action. It will remove the spots that are on the teeth and make them disappear. The use of baking soda to get white teeth is simple. Just wet your toothbrush with water and then sprinkle it with a pinch of baking soda (the finer it is, the better). If desired, you can put toothpaste over it. read more