Dear Lybrate user, a mouth ulcer
usually takes 7-10 days for complete
healing so don't worry. Drink plenty of water and fluids. Avoid extremely oily, fried, hot and spicy foods and beverages. Be careful while brushing. You ca have some over the counter available B complex tablets for a week. Apply mucopain ulcer gel over the affected area 3 times daily. Let it stay in contact with the ulcer for 5-10 minutes. Until then, just hold your saliva, don't swallow. After that, just spit and don't eat or drink anything for 30 minutes. You'll be fine very soon.