Background: Primary teeth are important for eating, speaking, and esthetics, as well as for guiding the eruption and maintaining the space for the permanent teeth. The best space maintainers (SM) for permanent dentition are the natural primary teeth. The aim of this study was to assess parents' knowledge and awareness of the importance of primary teeth and SM in Saudi Arabia.Method: This cross-sectional study invited parents who were living in Saudi Arabia via different social media platforms to complete a validated questionnaire. The data collected included demographic characteristics, questions about parents' knowledge of their children's oral hygiene, and the importance of primary teeth, as well as questions about knowledge of SM.Results: A total of 392 participants completed the questionnaire. Dental problems and pain were the most common reasons for visiting the pediatric dentist (n=260; 66.3%). With respect to the age at which the first primary tooth erupted, more than half of the parents (n=270; 68.9%) knew the correct age. Only 43.3% (n=168) of the parents had received any information about SM and only 39.5% (n=155) of them knew their purpose.Conclusion: Most parents agree that treating primary teeth is important for their children's oral health and development. However, most are unaware of an SM's purpose. We recommend that dentists discuss SM's importance with parents actively after extracting their child's teeth. This will help increase parents' awareness and understanding of SM and encourage them to be more informed about this dental treatment option.