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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.
Other causes of gum pain can be impaction, infection, tooth decay, cysts and pain due to pressure. 1  When the wisdom tooth doesnât fully grow but breaks out from the gums, the condition is called impacted tooth.  When an erupted wisdom tooth is covered with a flap of skin, gum infection like pericoronitis occurs.