journal of dental research (jdr) published an article about the epidemic condition of severe periodontitis in 2014. this article systematically reviews the worldwide epidemic condition of severe periodontitis from 1990 to 2010, showing that severe periodontitis has become the sixth most popular disease around the world. in the population over the age of 15, the morbidity was around 11% and the number of new cases was 701/100,000 in 2010. since the paper only investigate the epidemic condition of severe periodontitis, it is estimated that the morbidity is likely to exceed 50% when including mild and moderate periodontitis. in recent years, the incidence of periodontal disease is on the rise with the aging tendency in all age groups over the age of 15, the prevalence of severe periodontitis with rising with the increase of the age. in age group of 20
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