How to Make Mouthwash With Peroxide

Use hydrogen peroxide to clean your mouth.
Use hydrogen peroxide to clean your mouth. (Image: brown bottle image by Jim Mills from

If you suffer minor gum irritation or inflammation, a healing mouthwash made from simple hydrogen peroxide can help your mouth heal. Whether you have an injury, canker sore infections or you are recovering from a procedure in your mouth, hydrogen peroxide can help keep your mouth clean, which can reduce infection and complications. The U.S. National Library of Medicine recommends using hydrogen peroxide as a mouthwash rinse to treat mouth sores.

Things You'll Need

  • 3 percent hydrogen peroxide
  • Small glass

Mix about 1/2 oz. hydrogen peroxide with 1/2 oz. cool water in the small glass.

Pour the diluted hydrogen peroxide into your mouth and swish the liquid around your mouth.

Continue swishing the liquid in your mouth for about one minute then spit it out.

Repeat the hydrogen peroxide mouthwash up to four times in a 24-hour period. Rinsing after meals can be especially effective.

Tips & Warnings

  • Supervise children under 12 when they use hydrogen peroxide mouthwash.
  • Consult a physician or dentist before using a hydrogen peroxide mouthwash on a child under 2 years of age.
  • Do not use the hydrogen peroxide mouthwash for more than seven consecutive days.
  • Stop using the hydrogen peroxide if your symptoms become worse.
  • Never swallow hydrogen peroxide -- it is poisonous. Call Poison Control if accidental ingestion occurs.

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