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. As for now U can apply Dologel CT 4 times a day along with vitamin b supplement. Warm saline rinse is advised. Avoid spicy food  till the problem is resolved .

Nothing to worry , apply Dologel CT 3-4 times daily for pain relief , it will last 7-14 days and heal on its own , avoid eating spicy food and very hot drinks or food , sleep daily atleast for 8 hrs , consume water frequently , include fresh fruits and vegetables in your daily diet