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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.
Periodontitis Causes. Left untreated, gingivitis can progress to periodontitis. The bacteria from plaque causes gum inflammation, which leads to infection. Bacterial toxins and the bodyâs natural response to infection start to break down the bone and connective tissue that hold teeth in place.