How old is the ulcer & which place is it. Candid mouthpaint is not recommended for mouth ulcer. Do visit a dentist for opinion and correct treatment.
Next Steps
Kindly discontinue use of tobacco in any form if present in your lifestyle.
Health Tips
For pain releif you can use Ointment Dologel CT. Apply it before meals or as required. This is only a temporary solution you need to know the exact cause of ulcer.