Effectiveness of MySmile App for Improving the Oral Health of Secondary School Children:

The selection of schools into the study will involve three (3) sampling levels. At the first level, acknowledging the division of secondary schools in the district into urban and rural, one matched-pair will be randomly selected from urban area, and another matched pair will be randomly selected from rural area. At the second level, randomisation of the school is carried out. The 2 schools in each of the matched-pair will be randomly allocated to intervention and control group. At the third level, six (6) classrooms from moderate academic performance level will be selected (2 classrooms from Form 3, Form 4, and Form 5, respectively). Students who fulfil the inclusion criteria will be invited to participate in the study. The randomisation sequence will be carried out by the statistician at the Faculty of Dentistry, Universiti Malaya