Baking soda has natural whitening properties, which is why it's a popular ingredient in commercial toothpaste.
It's a mild abrasive that can help scrub away surface stains on teeth.
Additionally, baking soda creates an alkaline environment in your mouth, which prevents bacteria from growing.
This is not a remedy that will whiten your teeth overnight, but you should notice a difference in the appearance of your teeth over time.
Science has not yet proven that brushing with plain baking soda will whiten your teeth, but several studies show that toothpaste with baking soda has a significant whitening effect.
One study found that toothpastes containing baking soda were significantly more effective at removing yellow stains from teeth than standard toothpastes without baking soda. The higher the concentration of baking soda, the greater the effect.
Furthermore, a review of five studies found that toothpastes containing baking soda removed plaque from teeth more effectively than non-baking soda toothpastes.
To use this remedy, mix 1 teaspoon of baking soda with 2 teaspoons of water and brush your teeth with the paste. You can do this a few times per week.
You can buy baking soda at a grocery store or find it online.
Brushing with a paste made with baking soda and water can reduce bacteria in your mouth and buff away surface stains.