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Canker Sores are contagious.

www.medicinenet.com/are_canker_sores_contagious/article.htm

Aug 10, 2015 ... Learn how canker sores are transmitted. Causes of canker sores include allergies, hormonal changes, certain hormonal changes, food ...

www.webmd.com/oral-health/understanding-canker-sores-basics

Mar 27, 2017 ... Unlike cold sores, canker sores are not contagious. They don't pose any health risk other than the discomfort that comes along with them.

kidshealth.org/en/teens/expert-canker-sores.html

So how can you tell if a sore is a (non-contagious) canker sore or a contagious cold sore? Cold sores usually develop outside the mouth, around the lips, chin, ...

www.colgateprofessional.com/patient-education/articles/what-are-canker-mouth-sores

Canker sores are small white swellings or sores surrounded by an area of redness. While canker sores are not contagious, they are often confused with cold ...

www.therabreath.com/what-causes-canker-sores.html

A canker sore is a small aphthous ulcer that can appear inside the oral cavity, ... While these sores can cause discomfort and pain, they are not contagious.

goaskalice.columbia.edu/answered-questions/cold-sores-vs-canker-sores-%E2%80%94-oral-sex-risks

Oct 9, 2014 ... In contrast to canker sores, cold sores are extremely contagious and are most often caused by the herpes simplex virus type 1 (HSV-1).

goaskalice.columbia.edu/answered-questions/oral-sex-canker-sores

Oct 9, 2014 ... Is it safe to have oral sex when either partner has a canker sore — not ... by a virus, and they are not contagious, or a sign of any other disease.

www.mayoclinic.org/diseases-conditions/canker-sore/basics/definition/con-20021262

Mar 19, 2015 ... Unlike cold sores, canker sores don't occur on the surface of your lips and they aren't contagious. They can be painful, however, and can make ...

articles.mercola.com/canker-sore/symptoms.aspx

Find out the common canker sore symptoms and learn why knowing what canker sores look like and where they develop can make a big difference.