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1 Contributor: Anonymous on Feb-11-2009 10:50:01 |
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Canker sores, also called aphthous ulcers, are small, shallow lesions that develop on the soft tissues in your mouth — under your tongue, inside your cheeks or lips, and at the base of your gums.
http://www.mayoclinic.com/health/canker-sore/DS00354 |  Report
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