When swallowed, 3 percent hydrogen peroxide can cause stomach irritation and even chemical burns in some cases. Hydrogen peroxide cancer treatments usually involve 35 percent hydrogen peroxide.

Patients can use a hydrogen peroxide mouth wash to help whiten their teeth ... It can be applied to the skin to prevent minor burns, scrapes, and cuts from becoming infected.

Hydrogen peroxide is a clear, colorless liquid with a slightly bitter taste that you’ve probably seen in many households.