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What Are the Treatments?

Canker sores generally go away by themselves, and in most cases, you can safely ignore them. Many doctors suggest the use of over-the-counter ointments to relieve the discomfort of a canker sore - such as those for a toothache.

Look for a medicine that contains glycerin, which protects the sore, and peroxide, which fights bacteria. An easy home remedy is to apply a diluted hydrogen peroxide solution (1:1 with water), then coat them with a small amount of milk of magnesia several times a day.

If your sore does not respond to over-the-counter or at-home treatments, your doctor may prescribe a topical medication containing a steroid for the inflammation and lidocaine to relieve pain. If you have an infection, your doctor may treat it with an antibiotic solution to swish and spit. If the sore is the result of another medical condition, such as a food sensitivity, the underlying condition should be diagnosed and treated.