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  1. Periodontitis - Symptoms and causes - Mayo Clinic

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

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

  4. Periodontitis | American Dental Association - ADA

  5. Periodontal disease - Wikipedia

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

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

  8. Periodontal Diseases - Johns Hopkins Medicine

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

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