The deciduous dentition plays a crucial role in the development and growth of a child. Premature loss of deciduous teeth can result in the discrepancies in the arch length which in turn leads to malocclusion. Early intervention in deciduous and mixed dentition can prevent the development of anomalies in the late mixed and permanent dentition. Thus, Preventive Orthodontics plays an important role in the management of the spaces, occupied previously by deciduous teeth, using the ‘space maintainer’ appliance. In this review article, various types of space maintainers used in our day to day clinical practices will be highlighted.