The extra molecule of oxygen oxidizes (chemically breaks apart) many substances it comes in contact with, especially organic substances. But unlike water (H2O), hydrogen peroxide has two molecules of oxygen (H2O2), and this is what provides its super power for cleaning, disinfection, whitening, brightening and first aid. Let’s start with the basics: hydrogen peroxide is an odorless, colorless and tasteless liquid that looks similar to water and can easily be mistaken for it.