Question: How can you treat painful canker sores in your mouth? Answer: The easiest home remedy is to apply hydrogen peroxide with a cotton swab on the canker sore (1 part hydrogen peroxide to 1 part water). Then dab a small amount of milk of magnesia on the canker sore 3 - 4 times a day. This is not only soothing, but appears to help healing. See canker sores.
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