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Food grade hydrogen peroxide should not be used straight. It is very strong and dangerous at 35% strength. It must be diluted to 3% (11 parts water plus 1 part 35% hydrogen peroxide.) Then it still needs a lot of dilution again even before using in the sinuses.
Hydrogen peroxide is a highly reactive chemical containing hydrogen and oxygen. It is used mainly in the production of other chemicals and to bleach paper and textiles. Moreover, contact lenses can be disinfected with highly diluted hydrogen peroxide.. 4.1 Toothpastes and mouth rinses may also contain low concentrations of hydrogen peroxide as a disinfectant to prevent plaque and inflammation of the gums. Studies have shown that hydrogen peroxide from toothpastes or mouth rinses is rapidly broken down in the mouth by the saliva, but some of it is swallowed.