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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.
Causes of gum disease. Gum disease can be caused by a number of factors, but poor oral hygiene is the most common cause. Poor oral hygiene, such as not brushing your teeth properly or regularly, can cause plaque to build up on your teeth.s well as poor oral hygiene, a number of things can increase your risk of developing problems with your gums. These include: 1  smoking. 2  your age â gum disease becomes more common as you get older.