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

  5. Gingivitis: Causes, symptoms, and treatment - Medical News Today

  6. Gingivitis - Wikipedia

  7. Gingivitis - Gingivitis - Merck Manual Consumer Version