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What is a canker sore?

A canker sore is a small ulcer in your mouth. An “ulcer” just being a fancy term for a breakage of your skin. Sores inside your mouth feel different than sores outside your mouth – and you can’t use a bandage to protect them. Canker sores (or “aphthous ulcers”) can also be thought of as “shallow lesions” that develop on the inside of your cheeks, tongues and/or on your gums.

What causes canker sores?

Not everyone gets canker sores from drinking orange juice – because acidic foods are not the root cause. Historically, most research around canker sores focused on creating topical treatments and drugs to cure them – not on what causes them. Now, however, we have some more information on the cascade of events which leads to these painful, pesky oral sores.