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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 - Diagnosis and treatment - Mayo Clinic

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

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

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

  8. Periodontitis - Periodontitis - Merck Manual Consumer Version

  9. Periodontitis - Periodontitis - Merck Manual Professional Edition

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