Brushing or rinsing with baking soda could help whiten your teeth, but be aware you should use it carefully. To prevent dental erosion, brush with baking soda in moderation and avoid using too much force.
1. Mix together baking soda and water
In a small cup, mix ¼ to ½ teaspoon (1½ to 3g) of baking soda with enough water to form a paste. A paste of about 2 parts of baking soda mixed with 1 part of water is easier to apply and more effective than baking soda alone
2. Brush your teeth with the baking soda paste for 1 to 2 minutes.
Dip a soft a bristled brush into the paste, and gently scrub your teeth using circular motions.
Alternatively, use your fingertips to gently rub your teeth with the paste. Rub in soft circles, and don’t use too much force
If you have receding gums, avoid brushing the base of your teeth and around your gum line with baking soda. The substance that covers your teeth below the gums is softer than enamel and prone to damage
3. Rinse out your mouth when you’re finished brushing.
After brushing for 2 minutes, spit out the baking soda and rinse your mouth with water or mouthwash. Give your toothbrush a thorough rinse as well.