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.nidcr.nih.gov/HealthInformation/DiseasesAndConditions/GumPeriodontalDiseases/default.htm

MayoClinic.com: Gingivitis
- Symptoms, causes, treatment, and prevention.
- http://www.mayoclinic.com/health/gingivitis/DS00363

eMedicine Health - Periodontal (Gum) Disease
- Consumer health resource center providing information on the causes, symptoms, and treatment of gum disease.
- http://www.emedicinehealth.com/articles/20600-1.asp

eMedicine Health - Gingivitis
- Consumer health resource center providing information on the causes, symptoms, and treatment.
- http://www.emedicinehealth.com/articles/20577-1.asp

Gum Disease Information Bureau
- Advice on diagnosis and treatment of gum disease, gingivitis, periodontitis and mouth ulcers.
- http://www.gumdiseaseinfo.co.uk/

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

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