Baking soda and water for teeth whitening

Baking soda is sodium bicarbonate, an alkaline powder with abrasive particles. Brushing with it can disturb some external stain, while true bleaching uses a peroxide gel that changes chromogenic molecules within enamel and dentin.

The result depends on whether the discoloration is on the surface, inside the tooth, from decay, or in a restoration. Abrasive rubbing can also expose more dentin if enamel is worn, making sensitivity or yellow root surfaces more noticeable.

Use a fluoride toothpaste for routine brushing and clean between the teeth. A dentist can check for decay, cracks, gum recession, and existing crowns or fillings before selecting a whitening method and concentration.

Seek care for a single dark tooth, pain, sensitivity, cavities, gum irritation, or discoloration that appeared after trauma. Whitening should be postponed until active disease is assessed.