Canker sores, also called aphthous ulcers, are small, shallow lesions that develop on the soft tissues in your mouth or at the base of your gums. Canker sores are white or yellow spots surrounded by a bright red area with a tingling sensation in your mouth.

In most cases, the canker sores go away without treatment. Try not to eat hot or spicy foods, which can cause pain. Canker sores almost always heal on their own. The pain should decrease in a few days. The symptoms can be relieved using gels, creams, or mouthwashes that contain painkilling or anti-inflammatory medication. Other symptoms disappear in 10 to 14 days. Contact your dentist if a canker sore or mouth ulcer does not go away after 2 weeks of home care or if you develop more severe symptoms or complications.

When should you see a doctor?

Consult your doctor if you have any of the following symptoms:

• Canker sores that are unusually large.
• Recurrent sores, when new ones appear before old ones heal, or frequent outbreaks.
• Sores that persist for two weeks or longer.
• Sores that go all the way into the lips (vermilion border)
• Pain that you are unable to control through self-care methods.
• Extreme difficulty in eating or drinking.
• Canker sores with fever.

Consult your dentist if you have sharp tooth surfaces or dental appliances that appear to be the source of the sores.
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