Apthous ulcers or the ulcers of the mouth are an enigma for medicine. In the sense, we still don't know the exact cause of the problem, hence cannot have a sure-shot cure.
Firstly, get yourself evaluated as many types of ulcers occur in the mouth, some of which have specific treatments.
Health Tips
General well-being of the gums and cheek mucosa are paramount to having less or no ulcers. Good diet including enough water intake, regular moderate exercise and stress-free lifestyle can always help.