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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 Sore gums: The following medical conditions are some of the possible causes of Sore gums. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Wisdom teeth emerging. 2  Leukaemia. 3  HIV. 4  B12 deficiency. 5  Poor dental hygiene. 6  Vigorous brushing. 7  Acute herpes gingivostomatitis. 8  Candidiasis. 9  Malabsorption. 10  Scurvy. 11  Poorly fitting dentures. 12  Lichen planus. 13  SLE.