Let ice chips melt over the ulcers, or rinse your mouth with salt water or baking soda and water to lessen pain. Avoid spicy, acidic, or abrasive foods.

See a doctor immediately if:

• High fever
• Very difficult to eat or drink

Make an appointment to see a doctor if:

• Very large ulcers
• Lasting two weeks or more
• Pain that doesn't respond to self-treatment
• Recurring sores