Gum Disease Information 
The American Academy of Periodontology's description of periodontal (gum) diseases, including gingivitis and periodontitis.
http://www.perio.org/consumer/2a.htmlMedlinePlus 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 Bureau
Advice on diagnosis and treatment of gum disease, gingivitis, periodontitis and mouth ulcers.
http://www.gumdiseaseinfo.co.uk/
eMedicine Health - Gingivitis
Consumer health resource center providing information on the causes, symptoms, and treatment.
http://www.emedicinehealth.com/articles/20577-1.asp
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
MayoClinic.com: Gingivitis
Symptoms, causes, treatment, and prevention.
http://www.mayoclinic.com/health/gingivitis/DS00363
Periodontal Health - OHSU
Overview, symptom and treatment information from Oregon Health and Sciences University.
http://www.ohsu.edu/health/health-topics/topic.cfm?id=9093
ADA: Gum Disease (Periodontal Disease)
Detection, treatment and, prevention of periodontal diseases, from the American Dental Association.
http://www.ada.org/public/topics/periodontal_diseases.asp
AirPerio
Presents information about a new program to treat periodontal gum disease. Combining three therapeutic elements that work together for complete healing. Details about the DNA test, treatment and hygiene.
http://www.airperio.com/
