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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.
Review the treatment information pages for various causes of Sore gums 1  : Dental tissue neoplasm-gum pain. 2  Gingivitis-tender gums. 3  Impacted tooth-gum pain.4  Leukaemia. 5  HIV. 6  B12 deficiency. 7  Candidiasis.8  Scurvy. 9  Lichen planus.eview the treatment information pages for various causes of Sore gums 1  : Dental tissue neoplasm-gum pain. 2  Gingivitis-tender gums. 3  Impacted tooth-gum pain. 4  Leukaemia. 5  HIV. 6  B12 deficiency. 7  Candidiasis. 8  Scurvy. 9  Lichen planus.