Background: Premature loss in deciduous teeth is a condition of missing deciduous teeth before eruption of the permanent teeth, caused by caries, trauma and systemic conditions. Premature loss can cause a reduction in dental arch length and migration of antagonist teeth which cause rotation, crowding and impaction of permanent teeth. The aim of the study is to determine the prevalence of premature loss deciduous teeth in 9-10 year-old children in SD IT Insan Utama. Methods: The design of this study is descriptive. This study is conducted by describing data from prevalence of premature loss deciduous teeth in 9-10 year-old. The population of the study are 216 chidren, based on inclusion criteria, 63 children are the respondents of the study. This research is conducted by observing at the condition of the teeth experiencing premature loss. Results: The results showed that 63 respondent based on the age, 41.2% has premature loss in deciduous first molars, 37.3% in deciduous canines, 21.6% in deciduous second molars. Premature loss based on gender showed that premature loss in boys are 38 children (60.3%) while in girls are 25 children (39.7%). the highest prevalence of premature loss is in 9-year-old children, as many as 36 children (57.1%) of 63 child samples, and the highest prevalence is in the posterior region of 18 children (58.1%). Conclusion: It can be conclude that prevalence of premature loss in children aged 9-10 years at SD IT Insan Utama is 29.16%.