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Trumbull, CT
A 21-year-old male asked:

Iv known canker sores as sores in ur mouth from biting cheeks and 2 much citrus stuff. now my dental hygienist says they r a contagious sore. confused?

2 doctor answers7 doctors weighed in
Dr. Paul Grin
Pain Management 36 years experience
Not contagious: Canker sores are not pleasant and can be painful and uncomfortable, they are not contagious. Do not confuse with a cold sore, which is normally on the outside of the mouth and usually are highly contagious.
Dr. John Chiu
Allergy and Immunology 57 years experience
Not: Canker sores are not contagious . Cold sores caused by HSV I are not contagious either since most of us have already been infected with this virus but only a small % people end up with cold sores.

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Last updated Oct 4, 2016

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