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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.
There are three stages of gum disease: 1  Gingivitis: this is the earliest stage of gum disease, an inflammation of the gums caused by plaque buildup at the gumline. 2  Periodontitis: at this stage, the supporting bone and fibers that hold your teeth in place are irreversibly damaged.