Children’s Dental Sealant Use and Caries Prevalence Affected by National Health Insurance Policy Change: Evidence from the Korean National Health and Nutrition Examination Survey (2007–2015)

= 8161, aged 6-14 years) were derived from the Korea National Health and Nutrition Examination Survey (2007-2015). We also conducted subgroup analysis to determine the effects of the NHI policy on dental sealant and untreated caries by income level. Implementation of dental insurance coverage was associated with higher likelihood of using dental sealant (odds ratio (OR) = 1.39 (95% confidence interval (CI): 1.18-1.63) for the first period and OR = 1.58 (95% CI: 1.33-1.87) for the second period) and lower odds of having untreated caries (OR = 0.79 (95% CI: 0.64-0.98) for the first period and OR = 0.65 (95% CI: 0.51-0.83) for the second period) after controlling for covariates. Results revealed that there was a greater prevalence of dental sealant and a lower prevalence of untreated caries in both middle- and low-income households compared to high-income households. The higher prevalence of dental sealant and lower untreated caries after the policy implementation. Moreover, we demonstrated children from low-or middle-income households were more associated with increasing dental sealant use and a declining prevalence of caries.