How to whiten your teeth:

Baking soda is good for brushing your teeth. Water your toothbrush and dip it into baking soda to create natural baking soda toothpaste. Brush your teeth and then rinse your mouth. To increase effectiveness and make your mouth feel clean and fresh after the brushing add a few drops of lemon, cinnamon or peppermint essential oils. Your teeth will be whiter, without stains and polished after the brushing with baking soda.

After a couple of weeks of brushing with baking soda every second day, you should cut back to doing it just once or twice a week. This is because the abrasive properties of the baking soda may damage the enamel on your teeth if used too frequently.
Be aware that brushing your teeth with baking soda should not replace brushing your teeth with regular toothpaste. Regular brushing will help to fight cavities, plaque build up, gum disease, and keep your breath fresh.
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