The aim of the present systematic review and meta‐analysis was to evaluate the prevalence of dental caries among preschool children who had been born preterm and/or with low birth weight (LBW) compared with those who had been born full term and/or with normal birth weight (NBW). Eight electronic databases were searched from interception up to November 2018 with no restrictions imposed regarding the date of publication or language. Two independent reviewers screened studies, extracted data, and assessed the risk of bias. A random‐effects meta‐analysis was run to pool the crude prevalence of dental caries according to gestational age and birth weight. We performed a narrative synthesis and assessed the certainty of evidence using the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE). Fifty‐nine observational studies were included (55 in the meta‐analysis). The prevalence of dental caries was 39% among preterm children, 30% among full‐term children, 40% among LBW children, and 33% among NBW children (I2:97%‐99%). The majority of studies reported that dental caries was not associated with gestational age or birth weight, with very low certainty of evidence. Preschool children born preterm or with LBW have similar dental caries experience as those born full term or with NBW, with very low certainty of evidence (PROSPERO #CDR42018118086).

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The aim of the present study was to evaluate the prevalence of active and passive smoking during pregnancy and its association with sociodemographic indicators, as well as perinatal and postnatal outcomes in newborns. Methods: This cross-sectional study was comprised of 431 pairs of mothers/ newborns. The study variables were: preterm birth, birth weight, oral mucosal lesions, sociodemographic indicators and smoking data. We collected data from medical records and through a self-administered questionnaire answered by mothers. A pediatric dentist examined the newborns for oral mucosal lesions. Bivariate and multivariate logistic regression models were used to evaluate the association between active and passive smoking and the other variables (α=5%). Results: The prevalence of active (9.5%) and passive smoking (4.2%) during pregnancy was low. Active smoking was statistically associated with low birth weight (OR: 2.4; 95%CI:1.1-5.3), lower schooling level (OR: 0.2; 95%CI:0.1-0.5) and mothers aged ≥36 years old (OR: 4.9; 95%CI:1.2-20.0). Passive smoking was not statistically associated with the other variables. There was no association between active or passive smoking during pregnancy and premature birth and oral lesions of the newborn. Conclusions: The prevalence of active and passive smoking were low. Active smoking was associated with low birth weight, maternal age and mother's schooling, suggesting a social influence of smoking behavior among a population with a lower educational level. There was no association between active and passive smoking and prematurity and oral lesions of the newborn

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