Question: how often can you use hydrogen peroxide as mouthwash?
Answer: For HYDROGEN PEROXIDE 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.