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  1. Receding Gums: Causes, Treatment, Surgery, and Prevention - WebMD

  2. Periodontitis - Symptoms and causes - Mayo Clinic

  3. 4 Signs You Have Gum Disease and What to Do About It

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

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

  6. Gum Recession: Causes, Prevention, Surgery & Treatment - Cleveland Clinic

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

  8. Periodontitis - Diagnosis and treatment - Mayo Clinic

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