Introduction: Teeth are hard tissues in the human body whose development is affected by sexual dimorphism caused by chromosomal differences. The X chromosome plays a role in the formation of enamel thickness, while the Y chro-mosome contributes to the difference in thickness of the dentine. This study aimed to analyze sexual dimorphism in the height and width of the deciduous dentin based on panoramic radiographs. Method: The research material used 60 medical records of a panoramic radiograph of boys and girls aged 5-11 years. Measurements were made on canine teeth, molar 1, and molar 2 on all tooth parts using the CliniView 3.02 application. Furthermore, the data obtained were carried out statistical tests Independent T-test for compare each group. Results: The Independent T-test showed there were significant differences in the height and width of dentine in male and female deciduous teeth because the significance value was p <0.05. Conclusion: There are differences in the height and width of dentine in deciduous teeth where male have a larger size than female. This difference can be caused by several factors such as the influence of chromosomes and hormones.