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  1. Periodontitis - Symptoms and causes - Mayo Clinic

  2. Periodontitis | American Dental Association - ADA

  3. What to Know About Periodontal Scaling and Root Planing - WebMD

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

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

  6. Gum Disease and Older Adults - American Academy of …

  7. Periodontal Disease (Gum Disease): Causes, Symptoms & Treatment

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

  9. Periodontal disease - Wikipedia

  10. What is a Periodontist? Definition & Types of Periodontics