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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.
Full Answer. Most cases of swollen gums result from gingivitis, a gum disease that leads to irritation and swelling of the gums, notes Healthline. Poor oral hygiene is a common cause of gingivitis, as it leads to the accumulation of plaque on the teeth and gum line.