Background: Many parents think that primary teeth are not important because they will be replaced by permanent teeth. This view needs to be straightened out because even though primary teeth are temporary, primary teeth have an important function for children. Space maintainer is a tool that functions to maintain space due to premature loss of primary teeth so that permanent teeth can erupt in their place. Purpose: To describe the level of knowledge of parents about space maintainers in children. Methods: This type of research was observational descriptive with a cross-sectional design. Data collection was carried out to 100 people using consecutive sampling technique using a questionnaire on parents' knowledge about space maintainers in children which was directly distributed by the researcher to the respondents. Results: The results of the study were 50 respondents (50%) showing a good level of knowledge and 50 respondents (50%) had a less knowledge level related to space maintainers. Conclusion: The level of parental knowledge about dental and oral health is quite good, parental knowledge about teeth development is still lacking, and parental knowledge about space maintainers is quite good.

<p><strong><em>Background:</em></strong><em> First permanent molars play very important roles in the oral cavity. Therefore, tooth loss of these teeth due to caries has major impacts on oral health in the future. Panoramic radiographs have been used routinely in the oral health examinations and have accuracy comparable to intraoral radiographs in detecting carious lesions of posterior teeth. There have been no studies regarding the difference in the severity of caries in first permanent molars using panoramic radiographs before in Indonesia. </em><strong><em>Objective: </em></strong><em> </em><em>The objective of this study was to determine the difference in the severity of first permanent molars caries in children aged 6-9 years and 10-12 years based on panoramic radiographs at the RSGM-P FKG Trisakti University for the period 2017-2019. </em><strong><em>Methods: </em></strong><em>The </em><em>sample of this study</em><em> were 680 panoramic radiographs of children aged 6-9 years and 10-12 RSGM-P FKG Trisakti University for the period 2017-2019. In this study, an ICCMS index was used to determine the severity of caries in first permanent molars. </em><strong><em>Result: </em></strong><em>The Mann Whitney U test </em><em>used to determine the difference in the severity of caries showed </em><em>that </em><em>t</em><em>here was a difference in the caries severity of first permanent molars in children aged 6-9 years and 10-12 years (p &lt;0.05).</em><em> </em><strong><em>Conclusion: </em></strong><em>There was a difference in the caries severity of first permanent molars in children aged 6-9 years and 10-12 years<strong> </strong>based on panoramic radiographs at RSGM-P FKG Trisakti University for the period 2017-2019.</em><strong><em></em></strong></p><p> </p>