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sores (aphthous stomatitis) are painful white ulcers in the mouth. They appear
most often on the tongue, inside the cheeks, and inside the lips. Unlike cold
sores, canker sores are not contagious, but in some people they keep coming
back. Canker sores cause pain that may make it difficult to speak or
ByHealthwise Staff Primary Medical ReviewerKathleen Romito, MD - Family Medicine Specialist Medical ReviewerArden Christen, DDS, MSD, MA, FACD - Dentistry
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