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  1. Periodontitis - Symptoms and causes - Mayo Clinic

  2. Periodontitis | American Dental Association - ADA

  3. Periodontal disease - Wikipedia

  4. Periodontal Disease (Gum Disease): Causes, Symptoms

  5. Periodontitis (Gum Disease): Symptoms, Stages & Treatment

  6. Periodontitis - Diagnosis and treatment - Mayo Clinic

  7. Periodontal (Gum) Disease | National Institute of Dental and ...

  8. About Periodontal (Gum) Disease | Oral Health | CDC

  9. American Academy of Periodontology

  10. Periodontal diseases - PubMed