activated charcoal powder and brush for 2 minutes, then rinse thoroughly.

5.  Apple Cider Vinegar Rinse
 Apple cider vinegar has natural bleaching properties, though it should be used cautiously to avoid enamel erosion.
How to use: Dilute one teaspoon of  apple cider vinegar in a glass of water. Rinse your mouth with it for 30 seconds, then rinse again with plain water.
6. Strawberry and Baking Soda Scrub
Strawberries contain malic acid, which naturally helps remove stains from the surface of your teeth.
How to use: Mash one ripe strawberry and mix it with half a teaspoon of baking soda. Brush your teeth with this mixture once a week.

7. Brush with Hydrogen Peroxide (Diluted)
Hydrogen peroxide is a natural  bleaching agent often used in professional whitening treatments.
How to use: Mix equal parts hydrogen peroxide (3%) and water. Swish it in your mouth for 30