Developmental defects in enamel and their role in early childhood caries

ABSTRACT Developmental defects of enamel (DDE) are among the most frequently encountered dental anomalies in children and can have lasting consequences for oral health, yet they are often underrecognized in routine dental care. These defects, encompassing enamel hypoplasia and enamel hypomineralization, arise from disruptions during amelogenesis, the process of enamel formation, and can be triggered by a variety of prenatal, perinatal, and early childhood systemic factors. Enamel hypoplasia is a quantitative defect characterized by insufficient enamel deposition, resulting in grooves, pits, or areas of missing enamel, whereas enamel hypomineralization is a qualitative defect in which enamel of normal thickness is structurally weak, soft, and more porous, often appearing discoloured or chalky. Both types of defects compromise the tooth’s natural defence mechanisms, significantly increasing the susceptibility to early childhood caries, a rapidly progressing form of dental decay that often affects infants and young children. Historical research, from the pioneering work of Massler and Schour in the 1940s to more recent studies, has demonstrated how systemic stressors such as maternal malnutrition, prenatal infections, birth complications, low birth weight, childhood illnesses, and environmental exposures, including excessive fluoride, influence enamel development. Understanding the etiology, types, and clinical implications of DDE is critical for early detection, preventive care, and evidence-based management strategies.