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Related Experiment Videos

Changes in caries prevalence in Japan

H Miyazaki1, M Morimoto

  • 1Department of Preventive Dentistry, School of Dentistry, Nligata University, Japan. hideomiy@dent.niigata-u.ac.jp

European Journal of Oral Sciences
|August 1, 1996
PubMed
Summary

Dental caries (DMFT) in Japanese children increased with sugar consumption until 1975. Despite limited fluoride use, DMFT declined after 1981, with the reasons remaining unclear.

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Area of Science:

  • Dental Public Health
  • Epidemiology
  • Pediatric Dentistry

Background:

  • Dental caries (DMFT) in 12-year-olds in Japan increased significantly from 1957 to 1975.
  • This rise correlated strongly with increased sugar consumption post-World War II.
  • A notable decrease in DMFT was observed from 1981 onwards, despite limited fluoride interventions.

Purpose of the Study:

  • To analyze trends in dental caries (DMFT) in Japanese children.
  • To investigate the relationship between sugar consumption and caries prevalence.
  • To explore potential factors contributing to caries reduction in Japan.

Main Methods:

  • Analysis of historical dental survey data (DMFT) from 1957 to 1993.
  • Examination of per capita sugar consumption data in Japan.
  • Review of fluoride exposure levels and interventions during the study period.

Main Results:

  • Mean DMFT increased from 2.8 in 1957 to 5.9 in 1975, correlating with rising sugar intake.
  • Mean DMFT decreased from 5.43 in 1981 to 3.64 in 1993.
  • Fluoride usage remained limited, with no community water fluoridation since 1972 and low market share for fluoridated toothpaste.

Conclusions:

  • Sugar consumption is a significant factor driving dental caries (DMFT) trends in Japan.
  • The decline in DMFT since 1981 is not clearly explained by increased fluoride exposure.
  • Further research is needed to understand the multifactorial reasons for caries reduction in Japan.

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