Hydrogen peroxide is a substance that has traditionally been used as a wound cleanser. The regular, household-strength typically used for this purpose is a solution that has been diluted down to 3%. Hydrogen peroxide mouthwash products usually have an even lower concentration: 1.5%.
However, hydrogen peroxide is also available in industrial strengths (10% or higher). These industrial strengths, which are not intended for human consumption, include the so-called "food grade" hydrogen peroxide (35%). These higher strengths can be extremely dangerous, especially if they are not diluted appropriately.
(Click Hydrogen Peroxide to learn more about the dangers of high-strength hydrogen peroxide. You can also click any of the links in the box to the right for specific information.)