Linear Enamel Hypoplasia (IMAGE) University of South Carolina Caption Horizontal grooves in skeletal teeth (linear enamel hypoplasia) are an indication of physiological stress on an individual in early childhood, between six months and six years of age. Credit Sharon DeWitte Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.