Oral health is a very critical component of individuals' physical and psychological well-being. The present study aimed to investigate the dental health knowledge, attitude, and practice among schoolchildren in Abha. A cross-sectional epidemiological study was conducted. Each student completed a questionnaire regarding oral health. The participants were 800 students: 54.8% were male and 45.2% were female. Knowledge scores showed that -59.1% of the participants have fair knowledge. Statistically significant results were found between the age, school type, and students' educational level with the knowledge of oral health care (p < 0.05). More than half of the participants had positive attitudes (57.2%) and less than half demonstrated satisfactory oral health habits (45.3%). Students' educational level was significantly associated with attitudes and practices (p < 0.05). It can be concluded that the average knowledge, attitude, and practice level was 53.9%, which is not a positive indicator and needs to be strengthened.