A Answers (2)
While the actual cause of canker sores is unknown, these painful mouth ulcers may be linked to emotional stress, dietary deficiencies, hormones, allergies, celiac disease (gluten intolerance), and Crohn's disease, an inflammatory bowel disease. Some people may be genetically inclined to get mouth ulcers.
American Dental Association answeredThere are many causes for canker sores. One can be the symptom of a disease or disorder. Your mouth is the gateway to your overall health. For sores lasting over a week, see your dentist, who can determine if the sore is the cause of a larger oral health or health problem.