This data, published in January 2022, comes from a master file created by the American Dental Association based on information about the dentist population gathered from 2001 to 2021.
Listed below are the number of periodontists in the U.S. each year from 2001 to 2021:
2001 — 4,977
2002 — 4,921
2003 — 4,978
2004 — 5,094
2005 — 5,095
2006 — 5,105
2007 — 5,121
2008 — 5,173
2009 — 5,321
2010 — 5,455
2011 — 5,536
2012 — 5,575
2013 — 5,590
2014 — 5,607
2015 — 5,686
2016 — 5,772
2017 — 5,790
2018 — 5,751
2019 — 5,756
2020 — 5,723
2021 — 5,663
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