<![CDATA[Dental caries remains one of the most common oral health problems among school-aged children. At SDN Grabagan Sidoarjo, knowledge is one of the primary causes of caries in primarschool aged student. The DMFT index was found to be 3.2 and the deft index was 2. Low knowledge regarding dental caries can contribute to the high prevalence of dental caries among children. At SDN Grabagan Sidoarjo, students' knowledge level was found to be in the poor category, with an average score of 4.9. One effort that can be made to improve students' knowledge is through the use of attractive and interactive educational media, namely Dental Stacko. This study aimed to determine the effect of using Dental Stacko on knowledge of dental caries among upper-grade students at SDN Grabagan, Tulangan District, Sidoarjo Regency.This study employed an analytical research design using the Pre-Experimental One Group Pretest–Posttest Design method. The independent variable was the use of Dental Stacko, while the dependent variable was knowledge of dental caries. The study population consisted of 201 students, representing all upper-grade students of SDN Grabagan, Tulangan District, Sidoarjo Regency. A sample of 67 students was obtained using the Slovin formula. Data were collected using a dental caries knowledge questionnaire administered before and after the Dental Stacko intervention. The data were then analyzed using spss the Wilcoxon test.The results showed that before the intervention, most students had poor knowledge, with 38 students (56.7%) categorized as poor, 9 students (13.4%) as moderate, and 20 students (29.9%) as good. After the intervention, there was an improvement in knowledge, with 61 students (91.0%) categorized as good, 4 students (6.0%) as moderate, and 2 students (3.0%) as poor. The Wilcoxon test results showed a p-value of 0.000 (p < 0.05), indicating that H₀ was rejected and H₁ was accepted. It can be concluded that the use of Dental Stacko had a significant effect on improving knowledge of dental caries among upper-grade students of SDN Grabagan, Tulangan District, Sidoarjo Regency.Keywords: Dental Stacko, knowledge, dental caries, elementary school students]]>
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