• Keiko Tanaka, Yoshihiro Miyake, Chisato Nagata, Shinya Furukawa, and Masashi Arakawa.
• Department of Epidemiology and Preventive Medicine, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime 791-0295, Japan; Epidemiology and Medical Statistics Unit, Translational Research Center, Ehime University Hospital, Ehime, Japan. Electronic address: tanaka.keiko.jn@ehime-u.ac.jp.
• Environ. Res. 2015 Nov 1; 143 (Pt A): 148-53.

BackgroundEpidemiological studies of the association between smoking exposure and dental caries are limited.ObjectiveThe purpose of this cross-sectional study was to examine the association between prenatal and postnatal secondhand smoke (SHS) exposure and the prevalence of dental caries in primary dentition in young Japanese children.MethodsStudy subjects were 6412 children aged 3 years. Information on exposure to maternal smoking during pregnancy and postnatal SHS exposure at home was collected via parent questionnaire. Children were classified as having dental caries if one or more primary teeth had decayed or had been filled.ResultsCompared with never smoking during pregnancy, maternal smoking in the first trimester of pregnancy was significantly associated with an increased prevalence of dental caries in children (adjusted odds ratio=1.37, 95% confidence interval: 1.03-1.80). Postnatal SHS exposure was also positively associated with dental caries, with a significant positive exposure-response relationship. Compared with children not exposed to prenatal maternal smoking or postnatal SHS at home, those exposed to both prenatal and postnatal smoking had higher odds of dental caries (adjusted odds ratio=1.62, 95% confidence interval: 1.23-2.11).ConclusionOur findings suggest that maternal smoking during pregnancy and postnatal SHS exposure may be associated with an increased prevalence of dental caries in primary dentition.Copyright © 2015. Published by Elsevier Inc.

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