ADA: Gum Disease (Periodontal Disease): Detection, treatment and, prevention of periodontal diseases, from the American Dental Association.
eMedicine Health - Gingivitis: Consumer health resource center providing information on the causes, symptoms, and treatment.
eMedicine Health - Periodontal (Gum) Disease: Consumer health resource center providing information on the causes, symptoms, and treatment of gum disease.
Gum Disease Information: The American Academy of Periodontology's description of periodontal (gum) diseases, including gingivitis and periodontitis.
Gum Disease Information Bureau: Advice on diagnosis and treatment of gum disease, gingivitis, periodontitis and mouth ulcers.
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.