Comparative study of the dental health of 4-year-old children in north-eastern France between 2001 and 2018

To analyse the evolution of the oral health of 4-year-old children in nursery school between 2001 and 2018 as well as the early predictor and associated risk factors, in different school areas. We compared (1) the prevalence of ECC (4 ≥ dmft ≥ 1) and S-ECC (dmft ≥ 5) of 4-year-old children and (2) data obtained by a structured questionnaire completed by their parents from two studies performed in 2001 and 2018. Data were analysed using the Chi2 test and odds ratio (OR). A total of 322 children and of 425 children randomly selected among Moselle’s public nursery schools in north-eastern France were, respectively, included in the study in 2001 and 2018. The prevalence of ECC was respectively 40.70