The mouth is the opening by which food enters the body and where digestion begins by the mechanical breaking up of the solid food particles into smaller pieces.
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Marcovitch H., Black's Medical Dictionary, 41st edition, London, 2005.
Leikin J. B., Lipsky M. S., Complete Medical Encyclopedia, First edition, New York, 2003.
Wikipedia, the free encyclopedia (www.wikipedia.org).
Last update: 28th of August 2008.