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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.
Periodontal Disease â Gum disease / periodontal disease causes infected gum tissue to detach from the surface of the tooth, causing deep gum pockets around the tooth as well as gum recession. Gum disease differs from gingivitis, which is just inflammation of gum tissue.