Feasibility
DENTAL CARIES, RECRUITMENT, TOOTH EROSION
Regarding the feasibility of the study design, the high completion rate of the e-learning package and the positive evaluation of the e-learning learning materials suggest that although most research on oral care education has been conducted with children or dental students [One of the challenges we experienced was the small number of expatriates between the ages of 20 and 40 years who went abroad for long-term periods due to the spread of COVID-19. Since our program was focused on dental caries prevention at young and early middle stages, we excluded the middle-aged and older age groups. Therefore, in a full-scale RCT, recruitment during the recruitment period should be considered to increase the number of overseas workers who agree to participate in the study. For those who participated in the intervention, the rate of loss to follow-up was high, although few discontinued the intervention. As the study involved overseas workers, the posttest data collection was very time consuming. A longer posttest collection period from the outset, taking into account the time difference and internet availability when the questions were asked, would have reduced the drop-out rate.According to the evaluations of the content, the illustrations and cartoons were highly appreciated. In the e-learning program in this study, the participants’ attention may have been attracted by the design and colours that were used to make the elements of the IMB model attractive to learn.One of the negative comments was that it took too much time to learn the material. It takes approximately 40–45 min to watch the material. Considering that most participants spent 10–30 min watching the material, the content needs to be reduced slightly. For example, the information section had a lot of text and was content to educate dental students, so we could reduce it a bit with regard to content such as tooth erosion.