Baby teeth usually stay in place until “pushed out” by a permanent tooth that takes its place. Unfortunately, some children lose baby teeth too early. This can cause problems so it becomes necessary to use a space maintainer. A space maintainer is a device that saves room in the mouth for the adult teeth when the baby teeth come out too early. Ideally, baby teeth should be preserved until the adult teeth push them out naturally. Baby teeth are important for a child to eat comfortably and also to save space for the adult teeth. When they must be removed due cavities or injury, a space maintainer becomes necessary.