Gum Disease Information The American Academy of Periodontology's description of periodontal (gum) diseases, including gingivitis and periodontitis. http://www.perio.org/consumer/2a.html
MayoClinic.com: Gingivitis Symptoms, causes, treatment, and prevention. http://www.mayoclinic.com/invoke.cfm?id=DS00363
MEDLINEplus Medical Encyclopedia: Gingivitis Illustrations, causes, prevention, and treatment, from the National Library of Medicine. http://www.nlm.nih.gov/medlineplus/ency/article/001056.htm
NIDCR: Periodontal (Gum) Diseases The National Institute of Dental and Craniofacial Research describes gum disease and presents an overview of risks and treatments. http://www.nidr.nih.gov/health/newsandhealth/gumDiseasesPub.asp
