Dental Calculi of Siberian Natives, Russian Settlers, and Korean People of Joseon Dynasty Period in the 16th to 19th Century Eurasia Continent

Figure 2

The analysis of calculus rates by age. Red, blue, black, and white bars indicate adolescents, young adults, middle adults, and old adults in each group, respectively. The calculus prevalence per teeth generally increases as age increases in Siberian natives, Russian setters, and Joseon people groups. This phenomenon is particularly remarkable in the process of aging from adolescence to middle adult, but is decreasing in old adult.