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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.
There is no doubt that H2O2 is effective in treating infections topically. For ear infections, you may also use 3% hydrogen peroxide and pour one teaspoon or two into your ear. Hydrogen Peroxide will zap any bacterial/parasites that do not belong in your ears. Hold it in for at least 15 â 20 minutes or at least until the fizzing sound stops. H2O2 is effective in treating gum disease.