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  1. Periodontitis - Symptoms and causes - Mayo Clinic

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

  3. Gingivitis and Periodontal Disease (Gum Disease) - WebMD

  4. Periodontitis: Symptoms, Causes & Treatment - Cleveland Clinic

  5. Periodontal disease - Wikipedia

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

  7. Periodontitis - Diagnosis and treatment - Mayo Clinic

  8. Periodontal Diseases - Johns Hopkins Medicine

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

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

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