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Consensus has yet to be reached on the impact of early sugar introduction on early childhood dental caries (ECC). This study aimed to evaluate the association between the time of introduction of sugar in the infant’s diet and ECC at 48 months, using data from the 2015 Pelotas Birth Cohort Study. This Cohort comprises 4,275 children. At 48 months, 3,654 (91.1%) children had their oral health clinically evaluated by a team of 12 trained and calibrated dentists and their dental caries experience and cavitated lesions was assessed. The period of life in which sugar was first introduced into the child's diet was considered the primary exposure of the study, collected through questionnaires at 3, 12, 24, and 48 months of age. Analyses were conducted using Stata, version 15.0. Descriptive analyses were initially performed. Poisson regression with robust variance adjustment for the crude and adjusted analysis was used to estimate the effect of the sugar introduction on ECC. The highest prevalence of caries experience (43.3%) was in children in which sugar was introduced into the infant's diet before 12 months of age. A higher prevalence of caries experience was found for less educated (49.8%) and younger (51.7%) mothers, and in poorer families (48.3%).In the adjusted analysis, the experience of caries was 48% greater in the group with sugar introduction before 12 months of age, compared to those where sugar was introduced after 24 months of age In conclusion, our results support the adoption of preventive measures to delay the supply of sugar in early life in order to reduce the caries experience in children.

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