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  1. Periodontitis - Symptoms and causes - Mayo Clinic

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

  3. Periodontitis | American Dental Association - ADA

  4. Periodontitis: Effects, Stages, Reversing Progression - Verywell …

  5. Periodontitis - Periodontitis - Merck Manual Professional Edition

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

  7. Periodontitis: Treatment, home remedies, and symptoms - Medical News Today

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

  9. Periodontitis (Gum Disease): Causes, Symptoms, and Treatment - WebMD

  10. Periodontitis and systemic diseases: A literature review - PMC