How to get rid of ulcers in my mouth?

Prevent trigger: See prior answers relating to these for much more discussion. Each person usually finds that certain things trigger them, e.g. Citrus fruits, lack of sleep, weight loss, iron, vitamin B12 or Folic Acid deficiency, trauma, braces. There are some systemic diseases associated with these: crohn's, behcets, celiac disease. Also think of hot drinks. Oragel topically or antiviral rx early on may help.