<s>[INST] Ive had a canker sore at the hinge of my jaw in my mouth for 3 days now, and it doesnt seem to be healing at all. It really really hurts to talk, eat food and drink some liquids. Ive been using salt water and using listerine to help the pain, but it is only very temporary. What can I do? [/INST] Hello, Read your query, understand your concern don't worry as you have ulcer you can apply anapestic ointment McCoppin or colonel and take vitamin B supplement with Antioxidants.  Do Luke warm saline gargle two - three times a day.  Don't take stress, take proper sleep for eight hours, take nutritious healthy diet, Avoid junk food. Hope this will help you. If you have further queried I will be happy to help.  </s>