Ulcers, cracks and sores are common in the mouth and usually they go away after a few days. However, when there are internal diseases, mouth ulcers, sores and cracks can be just the alarm bells ...

Canker sores and oral cancer lesions may seem similar but there are ways to tell the difference. A lesion that's red, typically flat, and painful early on is usually a canker sore (aphthous ulcer).

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