Mouth ulcers for past 10yrs is very unusual considering your age. Just need to know that are you on any medication or associated with any medical issues. As mentioned ideally a dentist who specializes in oral medicine would be able help you in this regard.
The cause of mouth ulcers is not really known. Stress,medications or certain food items could be the culprit. It takes about a week to 10 days to go away. It can be managed to some extent with application of gels(available at medical store s) especially before meals
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