A canker sore, or aphthous ulcer, is an open sore inside the mouth – usually on the inner cheek, lips, or tongue. Most are oval-shaped or round with a markedly white or yellowish center.…
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A canker sore, or aphthous ulcer, is an open sore inside the mouth – usually on the inner cheek, lips, or tongue. Most are oval-shaped or round with a markedly white or yellowish center.…
