Adolescents smartphone screen time and its association with caries symptoms experience from the Korea youth risk behavior web-based survey 2020-2021.

Adolescence is a time when important changes occur in behavioral development, and previous studies have confirmed the relationship between excessive Internet use and decreased oral health behavior. Our purpose is to identify the indirect effects and behavioral factors of smartphone screen time on the caries symptom experience of adolescents. Using data from the 16-17th Korea youth risk behavior web based survey (2020-2021), we investigated the smartphone screen time of 109,796 students in middle school 1st to high school 3rd. Adolescents who used smartphones more than 6 h per week were 28% more likely to experience caries symptoms than those who used smartphones less than 2 h (odds ratio = 1.28; 95% confidence interval, 1.22-1.35). Those who consumed cariogenic drinks more than once a day were 25% more likely to experience caries symptoms, and those who brushed their teeth less than once a day were 26% more likely to experience caries symptoms (odds ratio = 1.25, 1.26; 95% confidence interval, 1.07-1.46, 1.06-1.51). Excessive smartphone screen time is associated with addictive eating habits and reduced physical activity that increase cariogenic dietary behaviors, and decrease oral health behaviors. It suggests that excessive smartphone use indirectly related to the experience of caries symptoms.