Hi, canker sore is harmless and usually go away within a couple of weeks. Usually occurs due to
vitamin deficiency, lip/cheek/tongue biting while eating or due to heat build up in the body.
Next Steps
Take multivitamin tablets for 15 days. Do not eat hot spicy food for a few days. Apply rexidine-M gel 2/3 times a day on the affected area 10 mins before eating to numb the area. Avoid citrus food for a few days. Have coconut water, curd, chia seeds mixed in water.
Health Tips
Consult a nearby dentist if problem persists.