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.
As of 2020, close to ** 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.
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MEXT (Japan). (July 28, 2021). Share of young students with dental caries in Japan from 2014 to 2020, by age group [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 28, 2026, from /statistics/1182335/japan-tooth-decay-among-children-by-age/
MEXT (Japan). "Share of young students with dental caries in Japan from 2014 to 2020, by age group." Chart. July 28, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 28, 2026. /statistics/1182335/japan-tooth-decay-among-children-by-age/
MEXT (Japan). (2021). Share of young students with dental caries in Japan from 2014 to 2020, by age group. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 28, 2026. /statistics/1182335/japan-tooth-decay-among-children-by-age/
MEXT (Japan). "Share of Young Students with Dental Caries in Japan from 2014 to 2020, by Age Group." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 28 Jul 2021, /statistics/1182335/japan-tooth-decay-among-children-by-age/
MEXT (Japan), Share of young students with dental caries in Japan from 2014 to 2020, by age group ÌÇÐÄÆƽâ°æ, /statistics/1182335/japan-tooth-decay-among-children-by-age/ (last visited July 28, 2026)
Share of young students with dental caries in Japan from 2014 to 2020, by age group [Graph], MEXT (Japan), July 28, 2021. [Online]. Available: /statistics/1182335/japan-tooth-decay-among-children-by-age/
