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U.S. National Institutes of Health National Cancer Institute
Dictionary of Cancer Terms
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oral cancer (OR-ul KAN-ser)

 Cancer that forms in tissues of the lip or mouth. This includes the front two thirds of the tongue, the upper and lower gums, the lining inside the cheeks and lips, the bottom of the mouth under the tongue, the bony top of the mouth, and the small area behind the wisdom teeth.

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