1. Pew.Older Americans need better success to dental care. The Pew Charitable Trusts/Research & Analysis/Fact Sheet.2016. Available from:http://www.pewtrusts.org/en/research-and-analysis/fact-sheets/2016/07/older-americans-need-better-access-to-dental-care?hd&utm_campaign=2016-07-27+DEN&utm_medium=email&utm_source=Pew
2. Prevalence of Periodontitis in Adults in the United States: 2009 and 2010
3. NorrisL.Dental coverage: What to expect from Medicare.Medicareresources.org.2015. Available from:https://www.medicareresources.org/blog/2015/07/16/dental-coverage-what-to-expect-from-medicare/
4. Oral health problems and mortality