6Hydrogen Peroxide
Hydrogen peroxide can be a natural bleaching agent, meaning it would eliminate bacteria in the mouth. Many commercial products add this ingredient with the same purpose. Nevertheless, several studies have raised certain questions concerning the safety of hydrogen peroxide. Overusing hydrogen peroxide or using strong concentrations would increase the risk of tooth sensitivity and gum irritation. Also, high doses can even cause concern for cancer. A good way to use hydrogen peroxide to whiten the teeth is to suck it as a mouthwash before brushing. It is advisable to choose a 1.5% or 3% solution to prevent side effects. [5]















