There was no significant difference in malocclusion between the case and control groups, contradicting a study with same-age children, which found that schoolchildren with malocclusion were 1.30-fold more likely to experience a negative impact on OHRQoL than those without malocclusion . This can be due to the cutoff point of the DAI. Malocclusion was dichotomized as either absent/mild (DAI ≤ 25) or present (DAI > 25). Thus, moderate malocclusions (DAI 26 to 30) could not have an impact on OHRQoL.