Tooth from study (IMAGE) New York University Caption Panel A is a longitudinal section of the maxillary second molar of a 35-year-old female who had children at ages 19 and 24. Panel B is a zoomed-in section of Panel A. Panel C reveals, at left, the dentine, covered, at right, by the cementum, which presents two distinct darker "rings" that correspond to the two reproductive events. Credit Image courtesy of Paola Cerrito Usage Restrictions Use in conjunction with this study only 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.