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Canker Sores: The Who, What, When, Where, Why, and How

Canker Sores: Causes, Symptoms, Treatments, and More What is a Canker Sore?A canker sore (aphthous ulcer) is a small, painful, open sore inside the mouth. They may occur on the tongue and on the inside linings of the cheeks, lips, and throat. Canker sores are usually white, gray, or yellow in color, surrounded by a […]