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Gum disease: what you need to know. American Academy of Periodontology website. Available at:
Updated May 2011. Accessed July 27, 2011.
Periodontal (gum) disease. National Institute of Dental and Craniofacial Research website. Available at:
. Updated March 2011. Accessed July 27, 2011.
Periodontal (gum) diseases. American Dental Association website. Available at:
Updated March 2005. Accessed April 23, 2009.
What is gum disease? American Dental Association website. Available at:
Published 2011. Accessed July 27, 2011.