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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 Painful Gums. Canker Sores Canker sore is a small ulcer crater in the lining of the mouth. Canker sores are one of the most common problems that occur in...learn more Â». Gum Disease Gum disease is caused by plaque and may result in tooth loss without proper treatment.