Salt and baking soda help remove stains from your teeth and brighten your smile. Salt has a natural source of fluoride, which is a bonus for your teeth and gums. Baking soda has been considered a natural bleach since ages, it whitens your teeth, rids them of tarter and plaque without being so abrasive that it wears away your tooth enamel.
All you need to do is mix one teaspoon salt and two teaspoons baking powder. Wet your toothbrush, dip it in the mixture, and brush your teeth like you normally do. If the taste is too intense, try applying a coat of toothpaste on the brush before dipping it in the salt and soda mixture.