Cross-section of Tooth (image) NIH/National Institute of Environmental Health Sciences Share Print E-Mail Caption This is a cross-section of tooth showing laser removal of the dentine layer, in tan, for analysis of metal content. Credit J. Gregory, Mount Sinai Health System Usage Restrictions For use with media stories on this release only. Share Print E-Mail 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.