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  1. Periodontitis - Symptoms and causes - Mayo Clinic

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

  3. Periodontitis - Diagnosis and treatment - Mayo Clinic

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

  5. Periodontitis | American Dental Association - ADA

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

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

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

  9. Periodontitis: Effects, Stages, Reversing Progression - Verywell …

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