Glass ionomer cements have been used in pediatric restorative dentistry for 20 years. Their usefulness in pediatric restorative dentistry is preferential relative to other materials because of their fluoride release, chemical adhesion to tooth structure, and availability to use in a variety of clinical scenarios. This paper reviews the use of glass ionomer materials in pediatric restorative dentistry. The paper provides a look at glass ionomer cements' use as sealants and restorative materials and examines glass ionomers as adhesives, as a stand-alone material and in the sandwich technique. This paper also provides a useful guide to connecting to other references regarding specific aspects of glass ionomers in children.