Japan: tooth decay among children by age

As of 2020, close to 42 percent of children aged 15 to 17 years old in senior high schools had dental caries, according to the medical examinations conducted at schools across Japan. In all age cohorts, the share of students with tooth decay has continuously declined since 2014.

Share of young students with dental caries in Japan from 2014 to 2020, by age group

Characteristic	5 years (kindergarten)	6 to 11 years (elementary school)	12 to 14 years (junior high school)	15 to 17 years (senior high school)
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Release date

July 2021

More information

Region

Japan

Survey time period

2014 to 2020*

Special properties

ages of respondents are as of April 1 of each year

Supplementary notes

*Due to the spread of coronavirus disease (COVID-19), the data from 2020 were based on the medical examinations conducted from April 1, 2020, to March 31, 2021.

Figures are based on the results of medical examinations that are conducted from April 1 to June 30 of each year among children aged between 5 to 17 years old in kindergarten to high school.

Sample size:
2014 n=3,337,494
2015 n=3,351,047
2016 n=3,437,062
2017 n=3,405,501
2018 n=3,423,771
2019 n=3,371,982
2020 n=3,340,921

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