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ADA: Gum Disease (Periodontal Disease)
Detection, treatment and, prevention of periodontal diseases, from the American Dental Association.
Gum Disease Information
The American Academy of Periodontology's description of periodontal (gum) diseases, including gingivitis and periodontitis.
MayoClinic.com: Gingivitis
Symptoms, causes, treatment, and prevention.
MEDLINEplus Medical Encyclopedia: Gingivitis
Illustrations, causes, prevention, and treatment, from the National Library of Medicine.
NIDCR: Periodontal (Gum) Diseases
The National Institute of Dental and Craniofacial Research describes gum disease and presents an overview of risks and treatments.
Periodontal Health - OHSU
Overview, symptom and treatment information from Oregon Health and Sciences University.