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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.
Use the hydrogen peroxide as a mouthwash daily before you brush your teeth. 1  Pour about 2 tablespoons (30 milliliters) of the antiseptic into your mouth, and swish it around for 1 minute. 2  Spit out the solution, and rinse your mouth with water. 3  Brush your teeth as you normally would.. Brush your teeth with a hydrogen peroxide and baking soda paste once a week. 1  Pour 2 teaspoons (10 milliliters) of hydrogen peroxide into 3 teaspoons (15 milliliters) of baking soda. 2  Mix these together until a paste forms.