Most mouth ulcers require no treatment and heal on their own within two weeks. Where there is an obvious cause, managing the cause will set the healing process in motion. For example:
Address any source of damage to the mucosal membrane: get damaged teeth, rough surfaces or ill-fitting dentures fixed.
Use a soft toothbrush to minimise further damage and replace it regularly.
Avoid any foods that you know cause the problem.
Choose softer foods that are less likely to aggravate an ulcer.
antimicrobial mouthwashes (these fight the bacteria, viruses and fungi that can cause infection if you are not able to brush your teeth properly)
local anaesthetic treatments in the form of a mouthwash, spray, gel or ointment