Final answer:
Hydrogen peroxide is used for tooth whitening, helping to remove stains on the teeth and resulting in a whiter smile.
Step-by-step explanation:
Hydrogen peroxide is used for tooth whitening. It can be found in most whitening toothpastes. Peroxides help to break down and remove stains on the teeth, resulting in a whiter smile. When hydrogen peroxide is applied to the teeth, it releases oxygen, which helps to remove surface stains and discoloration.