Remedy 1: Baking soda and hydrogen peroxide
They are commonly used in cleaning supplies and stain-removers for clothes, and they can have the same effect on pearly whites by eliminating plaque buildup and bacteria that creates stains, says Healthline.
Brush your teeth gently with a paste made of 1 tablespoon of baking soda with 2 tablespoons of hydrogen peroxide. Then thoroughly rinse your mouth. Alternatively, you can replace the hydrogen peroxide with water, and just use a baking soda paste.