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Can kissing cause aphthous stomatitis (canker sore)?

American Dental Association
American Dental Association
answer

Kissing cannot cause canker sores. While not pretty, they are not contagious. However, they can return frequently and may be only one canker sore or several. Their exact cause is uncertain but some experts believe that immune system problems, bacteria or viruses may be involved. Canker sores usually heal on their own after a week or two. 

RealAge
RealAge
answer
Canker sores, or aphthous stomatitis, are not contagious, which means that kissing does not pass canker sores to others. Canker sores are small crater-like patches, or ulcers, that form in the lining of the mouth. No one is sure what causes canker sores, but you may be more likely to develop them if you have been sick with a cold or flu or are feeling a high degree of stress. Canker sores usually go away without treatment in a week or so.

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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.