Pain from a canker sore generally lessens in a few days, and the sores usually heal without treatment in about a week or two. Cankers sores treated with dental lasers exhibit almost complete relief of the symptoms immediately. Talk to your dentist about the procedure. Can Canker Sores Be Prevented? Although there is no cure for canker sores, and they often recur, you may be able to reduce their frequency by: Avoiding foods that irritate your mouth, including citrus fruits, acidic vegetables, and spicy foodsAvoiding irritation from gum chewingBrushing with a soft-bristled brush after meals and flossing daily, which will keep your mouth free of foods that might trigger a sore You should call your dentist about canker sores if you have: Unusually large soresSores that are spreadingSores that last 3 weeks or longerIntolerable pain despite avoiding trigger foods and taking over-the-counter pain medicationDifficulty drinking enough fluidsA high fever with the appearance of the canker sores

Start Vitamin B complex capsules at least once a day , proper oral hygiene and proper quantity of water intake