Article in English: Ice can reduce swelling and numb the pain of a canker sore.  If you can, use your tongue to hold a chip directly against the sore until it dissolves.  Keep ice chips in a coffee thermos or a styrofoam cup to prevent rapid melting, and use them throughout the day. If ice chips are too cold for you, try to at least drink cool water throughout the day. Let it sit in your mouth and gently swish it against your sore before swallowing it. Spicy, acidic, and abrasive foods can irritate the sore. This will cause pain and may delay healing. Eat bland and soft foods to let your ulcer heal. Avoid carbonated drinks, citrus fruits, hard foods like toasted bread, and anything with a lot of salt or spice. A toothbrush slipping and scraping your mouth can actually cause an ulcer, and can definitely make a pre-existing one hurt more. Avoid aggravating your sore by using a toothbrush with soft bristles, and try to avoid touching the sore as well. Get toothpaste for sensitive teeth like Biotene or Sensodyne ProNamel to use until your sore heals. If you can't get rid of your mouth ulcer as soon as you'd like, you can at least try to improve your comfort. Take an over-the-counter pain reliever like ibuprofen, or use an OTC numbing gel. These are available at your local pharmacy.  If you have any medical conditions or take other medications, talk to the pharmacist or your doctor before choosing a medication. Don’t take aspirin if you’re under 16. Never give aspirin to a child. You can obtain zinc lozenges from your local drug store or pharmacy. Though these haven't been proven to be helpful, some people find that they ease discomfort and speed up healing. Use them as directed on the package. Vitamins B and C may help to heal mouth ulcers, though this needs to be studied further. Get vitamin supplements from your drugstore or pharmacy after speaking with your doctor or pharmacist. Only take the recommended amount. Lysine, an amino acid, could potentially help with your mouth ulcers. This needs more research, however. Ask your...

Summary in Vietnamese:
Mút đá viên. Tránh các món ăn có tính axit và thức ăn cay. Nhẹ nhàng khi đánh răng. Uống thuốc giảm đau không kê toa. Mút viên ngậm chứa kẽm. Thử dùng thực phẩm bổ sung vitamin. Uống thực phẩm bổ sung lysine. Uống echinacea (cây cúc dại).