Causes of periodontal disease

Please explain the causes of periodontal disease and the relationship between periodontal disease and systemic issues such as heart disease and diabetes. Use scientific data to explain the relationship between periodontal disease and systemic illnesses. Explain the importance of dental hygiene therapy. Use the following articles for references: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5426403/ https://onlinelibrary.wiley.com/doi/abs/10.1902/jop.2005.76.11-S.2089 https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1600-051X.1984.tb01305
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