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  1. Gingivitis - Symptoms and causes - Mayo Clinic

  2. Gingivitis: Symptoms & How To Treat It - Cleveland Clinic

  3. Gingivitis - Diagnosis and treatment - Mayo Clinic

  4. Acute Necrotizing Ulcerative Gingivitis (ANUG)

  5. Gingivitis - Gingivitis - Merck Manual Professional Edition

  6. Overview of gingivitis and periodontitis in adults - UpToDate

  7. Causes and treatment of gingivitis - Medical News Today

  8. Periodontitis - Symptoms and causes - Mayo Clinic

  9. Gingivitis (Gum Disease): Causes, Risk Factors, and Symptoms

  10. Gingivitis - Gingivitis - MSD Manual Consumer Version