The association between sealants and low birth weight showed a similar pattern, although the decreased incidence of low birth weight was more marked here. After adjustment for sociodemographic, medical, or potential dental risk factors of low birth weight, there was a 70 percent decreased odds ratio for low birth weight associated with the placement of sealant (95 percent confidence interval: 0.07, 1.35). Further analyses based on the number of sealants per woman did not identify any significant associations.