Food-Grade Hydrogen Peroxide Is A Tooth Cleanser One of the best home remedies for stained teeth you probably already have in your cupboard. Food-grade hydrogen peroxide is a great tool for eliminating stains on teeth and preventing new stains. But, food-grade hydrogen peroxide can be rough on gums if you use it at full strength frequently. It's better to dilute it a little bit or use it only on your teeth.  How it Works Food-grade hydrogen peroxide first attacks stains, plaque and food debris left on teeth and then gently lifts that debris off the tooth so it can be rinsed with saliva or water. The natural action of the peroxide is a great tooth cleanser and it will naturally whiten your teeth. However you need to be sure that you are using food-grade hydrogen peroxide and not just the peroxide that you can buy in the drugstore. Food-grade hydrogen peroxide is specially purified and has none of the contaminants that drugstore quality peroxide has. Food-grade peroxide is safe to be consumed if you accidently swallow some while you are using it to whiten your teeth.  How to Use It There are several ways that you can use food-grade hydrogen peroxide to whiten your teeth and prevent stains. You can brush your teeth with a mixture of hydrogen peroxide and baking soda which will clean and whiten teeth. Or you can use a toothbrush or small brush to apply peroxide to each tooth individually. Another way you can get the benefits of peroxide for tooth whitening is to rinse your mouth with a small amount of peroxide after meals. Mixing the peroxide with a little water is a good way to tone down the peroxide if it's too intense for you to use as a mouthwash. Over time peroxide may irritate the gums so watch for any redness or signs of irritation in your gums after using peroxide.