Canker Sore (Aphthous Ulcer)

Canker sores (aphthous ulcers), or aphthae, are the most common cause of periodic (recurring) ulcers inside the mouth and genital linings (mucous membrane surfaces). Their cause is unknown, but stress, lack of sleep, trauma, and perhaps some vitamin deficiencies, toothpastes, and foods can make the condition worse.

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