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== Epidemiology == {{main|Epidemiology of periodontal diseases}} [[File:Periodontal disease world map - DALY - WHO2004.svg|thumb|upright=1.3|[[Disability-adjusted life year]] for periodontal disease per 100,000 inhabitants in 2004:<ref>{{cite web |url=https://www.who.int/entity/healthinfo/statistics/bodgbddeathdalyestimates.xls |title=Mortality and Burden of Disease Estimates for WHO Member States in 2002|format=xls |work=World Health Organization|year=2002 }}</ref> {{Col-begin}} {{Col-break}} {{legend|#b3b3b3|no data}} {{legend|#ffff65|<3.5}} {{legend|#fff200|3.5β4}} {{legend|#ffdc00|4β4.5}} {{legend|#ffc600|4.5β5}} {{legend|#ffb000|5β5.5}} {{legend|#ff9a00|5.5β6}} {{Col-break}} {{legend|#ff8400|6β6.5}} {{legend|#ff6e00|6.5β7}} {{legend|#ff5800|7β7.5}} {{legend|#ff4200|7.5β8}} {{legend|#ff2c00|8β8.5}} {{legend|#cb0000|>8.5}} {{col-end}}]] Periodontitis is very common, and is widely regarded as the second most common dental disease worldwide, after [[dental decay]], and in the United States has a [[prevalence]] of 30β50% of the population, but only about 10% have severe forms. Chronic periodontitis affects about 750 million people or about 10.8% of the world population as of 2010.<ref>{{cite journal | vauthors = Vos T, Flaxman AD, Naghavi M, Lozano R, Michaud C, Ezzati M, etal | title = Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990β2010: a systematic analysis for the Global Burden of Disease Study 2010 | journal = Lancet | volume = 380 | issue = 9859 | pages = 2163β96 | date = December 2012 | pmid = 23245607 | pmc = 6350784 | doi = 10.1016/S0140-6736(12)61729-2 }}</ref> Like other conditions intimately related to access to hygiene and basic medical monitoring and care, periodontitis tends to be more common in economically disadvantaged populations or regions. Its occurrence decreases with a higher standard of living. In Israeli populations, individuals of Yemenite, North-African, South Asian, or Mediterranean origin have higher prevalence of periodontal disease than individuals from European descent.<ref name="pmid18780541">{{cite journal | vauthors = Zadik Y, Bechor R, Shochat Z, Galor S | title = [Ethnic origin and alveolar bone loss in Israeli adults] | language = he | journal = Refu'at Ha-Peh Veha-Shinayim | volume = 25 | issue = 2 | pages = 19β22, 72 | date = April 2008 | pmid = 18780541 }}</ref> Periodontitis is frequently reported to be socially patterned, i.e. people from the lower end of the socioeconomic scale are affected more often than people from the upper end of the socioeconomic scale.<ref name="Watt"/>
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