What Causes Recurrent Mouth Ulcers?
There are no antibiotics for this!
I have reviewed your question fully. Oral sores are not caused by bacterial and antibiotics are really not needed for their treatment. Relieving measures to address pain and step up oral hygiene to prevent further infection is what is truly required. Antibiotics will not change the course of this infection and treatment outcome.
I hope this helps and guides. I wish you well. Feel free to follow up with me if need be.