A member 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?

7 doctors weighed in across 2 answers
Dr. Paul Grin answered

Specializes in Pain Management

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.

Answered 10/2/2016

3.7k views

Thank
Dr. John Chiu answered

Specializes in Allergy and Immunology

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.

Answered 10/4/2016

3.7k views

Thank

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