Commonly Any mental stress
causes Stress Ulcer
very frequently. Normally other common reason is for Trauma or vitamins deficiency or poor oral hygiene. If ulcer is affecting same place for long time with other symptoms it can leter be a Cancer
. For normal cause only you maintain proper oral hygiene, use proper tooth paste. Do not use Hard brush. Take Vitamin b-complex & avoid Tobacco & Alcohol
. Atleast visit one time if ulcer is for long time.