Human Teeth vs. Rat Teeth (image) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Caption These tooth models show the relative size comparison of a human tooth versus a rat tooth -- to give an idea of the technical challenges involved with performing dentistry on such a small scale. NOTE: The small "rat tooth" is not an actual rat tooth but rather a resized human tooth. Credit James Weaver, Harvard's Wyss Institute Usage Restrictions James Weaver, Harvard's Wyss Institute 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.