Hello,
Mouth ulcers can be really irritating as they are very uncomfortable when we eat food while swallowing Or in general . Possible reason of chronic mouth ulcer would be constant trauma to that are for e.g : a sharp cusp of the tooth might irritate and lacerated the cheek or tongue region leading to ulcer.
Next Steps
Visit a nearby dentist
Health Tips
You can apply ghee which is easily available at home , honey or chew a piece of coconut n let the coconut milk stay in the mouth before you swallow it for immediate relief . Other medications available over the counter can also be applied .