How do I stop getting canker sores?


Canker sores cannot be entirely prevented or eliminated as a possible problem. That's because their exact cause is uncertain but some experts believe that immune system problems, bacteria or viruses may be involved. However, these typically go away on their own within a week. For persistent problems, see your dentist.


There's no known way to avoid canker sores, although you can try the following prevention tips:

  • Avoid abrasive foods, such as crackers and chips to avoid mouth injury.
  • Avoid spicy (chili peppers) or hot foods.
  • Stop chewing gum, as it increases the chance you might bite the inside of your mouth.
  • Be gentle when brushing your teeth, and use a mild toothpaste.
  • Avoid citrus fruits and drinks (tomatoes, pineapples, grapefruit, and oranges).
  • Learn to handle your stress, as emotional stress may trigger mouth ulcers.
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Prevention of canker sores is more important than treating them. In this video, Dr. Oz reveals what common product may cause canker sores.

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Canker Sores

Canker Sores

Aphthous stomatitis is a sore that forms inside the mouth, and the most common type is a canker sore. These sores, also called mouth ulcers, are yellow-gray with red rings around them and usually heal in a week or two. Sometimes c...

anker sores are larger or occur in clusters and can take over a month to heal. Treatment is usually with an oral antiseptic and analgesic. Learn more about what affects your risk for canker sores with expert advice from Sharecare.

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.