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Caries Res. 2015;49(6):595-9. doi: 10.1159/000441196. Epub 2015 Oct 30.

Trends in Social Inequality in Tooth Brushing among Adolescents: 1991-2014.

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University of Southern Denmark, National Institute of Public Health, Copenhagen, Denmark.


This study examines whether social inequality in tooth brushing frequency among adolescents changed from 1991 to 2014. The data material was seven comparable cross-sectional studies of nationally representative samples of 11- to 15-year-olds in Denmark with data about frequency of tooth brushing and occupation of parents. The total number of participants was 31,464, of whom 21.7% brushed their teeth less than the recommended 2 times a day. The absolute social inequality measured as prevalence difference between low and high social class increased from 7.7% in 1991 to 14.6% in 2014. The relative social inequality assessed by odds ratios for infrequent tooth brushing also increased from 1991 to 2014.

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