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There are different types of mouth sores. They can occur anywhere in the mouth including bottom of the mouth, inner cheeks, gums, lips, and tongue. Mouth sores may be caused by irritation from: A sharp or broken tooth or poorly fitting dentures.
WebMD explains that stomatitis occurs inside any part of the mouth including the cheeks, gums, tongue, lips and palate. Mouth ulcers or aphthous ulcers, herpetic sores and mouth irritation usually cause stomatitis. In addition to gum disease, stomatitis from mouth irritation often stems from biting the cheek, tongue or lip.