Whats the quickest way to get rid of painful mouth ulcers?

Remove the cause: To help your dentist determine the cause, do an audit: Have you changed diet, oral habits or hygiene? Have you moved? Perhaps you had a change in your health or medications? Has this happened before? How many times? How often? Once you have answered these, see your dentist. He or she can give you specific info & prescribe a simple mouth rinse or Rx to address the issue.