Canker sores are a common condition that affects the lining of the soft tissue of the mouth. The medical term for canker sores is “recurrent aphthous ulcerations” or simply “aphthae.” Canker sores start as white to yellowish ulcers that are surrounded by redness. They are usually very small (less than 1 mm) but may enlarge to ½ to 1 inch in diameter. They tend to be painful and can interfere with eating and speaking. Healing usually takes place in seven to 10 days.
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