Strengths
DENTAL CARIES
In the present study, a multi-stage cluster random sampling method was used, and a representative sample adjusted for the socio-economic status was recruited. To reduce the examiner bias, a previously validated questionnaire was used in addition to the CAST index to record the full spectrum of dental caries. Moreover, examiners in the present study were blinded and calibrated before data collection and used a visual aid containing CAST index classification details to reduce the risk of misclassification. In this trial, a comprehensive intervention package containing several components including supervised toothbrushing in school and a home package was used. For parents, the information delivered via a lecture, besides a pamphlet was provided for home use. As our sample was representative across the capital city of Tehran, local policymakers to improve the children’s oral health can use the results of our study.