Question: how often can you use hydrogen peroxide mouthwash?
Answer: Oral hygiene (with hydrogen peroxide 6%) Rinse or gargle 15 mL 2–3 times a day for 2–3 minutes, to be diluted in half a tumblerful of warm water. Rinse or gargle 15 mL 2–3 times a day for 2–3 minutes, to be diluted in half a tumblerful of warm water.