Study design
A randomized controlled clinical trial, with two parallel groups designed with a 1:1 allocation ratio. The participants were randomly assigned into two groups (The examination was performed under direct illumination using a dental chair light after drying the teeth with compressed air for 5 s. All the participants were examined by the same examiner (S. H.) to avoid intra-examiner errors. All patients were selected according to inclusion and exclusion criteria to have non-cavitated white spot lesions.