There r many reasons like dry mouth, Oral Lichen Planus,nutritional deficiency, anti hypertension drugs,antacids,allergies,acidity,hypothyroidism ,
Diabetes ,oral habits,depression, stress..
Next Steps
visit oral surgeon for proper diagnosis & treatments ..
gargle with Tanctum mouth rinse & then have food if discomfort during having meal..
Health Tips
don't suppress by taking unwanted medicines for symptomatic relief...