There could be many reasons for mouth ulcers .
Most common is aphthous ulcer, which can be resolved by taking vit B supplements for a week and mouth rinsing with salt water .
Next Steps
if ulcer is increasing or persistent, please consult for detailed examination and accurate diagnosis and management.
Health Tips
1. check for sharp tooth that could be causing constant irritation
2. stop use of tobacco chewable / smoke
3. use tooth brush with soft - moderate hardness bristles