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  1. Periodontosis - Wikipedia

  2. Periodontitis - Symptoms and causes - Mayo Clinic

  3. Periodontitis - Diagnosis and treatment - Mayo Clinic

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

  5. Periodontal disease - Wikipedia

  6. Periodontitis: Symptoms, Causes, and Treatments - Healthline

  7. Periodontitis - Periodontitis - Merck Manual Professional Edition

  8. Periodontitis - Periodontitis - Merck Manual Consumer Version

  9. Periodontitis | American Dental Association - ADA

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