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  1. Periodontitis - Symptoms and causes - Mayo Clinic

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

  3. Periodontal Disease (Gum Disease) - Cleveland Clinic

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

  5. Periodontitis - Diagnosis and treatment - Mayo Clinic

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

  7. Periodontitis | American Dental Association - ADA

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

  9. Gum Disease: Types, Symptoms, Causes, Treatment, & More - Health

  10. Gum Disease Facts | Oral Health | CDC - Centers for Disease