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  1. Periodontitis - Symptoms and causes - Mayo Clinic

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

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

  4. Periodontal Disease (Gum Disease) - Cleveland Clinic

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

  6. Here’s how to treat gum disease and how to know if you have ... - WebMD

  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

  10. Gum Problems Types, Causes, Symptoms, Treatment, Disease - MedicineNet