<![CDATA[Oral health is an important part of general health that needs to be instilled from elementary school age. low knowledge and proper understanding tooth brushing habits remains a major cause of oral health problems in children. This community service activity aims to improve oral health maintenance behavior and improve oral hygiene status through the 21-Day Toothbrushing Program for students at SD Negeri 084087, Sibolga City. The activity was carried out on 40 fourth-grade students using the methods of oral health education, demonstrations of correct tooth brushing methods, and mentoring for the 21-Day Toothbrushing Program for 21 days. Monitoring of program implementation was carried out through a WhatsApp group involving parents as mentors. Evaluation was carried out using a dental health behavior questionnaire and Oral Hygiene Index Simplified (OHIS) examination pre and post the program. The results of the activity showed that the majority of students aged 7–12 years (87.5%) and female (52.5%). The average increase in dental health behavior scores in the intervention group was 1.80 points, higher than the control group of 1.45 points. In addition, there was a decrease in the average OHIS score in the intervention group by 2.65 points compared to the control group by 2.05 points. Before the program, most students had poor dental hygiene status (80.0%), while after the program, most were in the good category (70.0%). The 21 Day Toothbrushing Program has proven effective in improving oral health behaviors and improving students' oral hygiene status. This program can be a sustainable promotive and preventive strategy to support the dental health of school aged children.]]>
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