Fast Toothpaste Check (image) Fraunhofer-Gesellschaft Caption Researchers intend to supplement their microtribological analyses of the interaction between toothbrush, toothpaste and tooth surface with practical tests, using a tooth cleaning machine they have developed themselves. Bottom right: Friction and wear tests with individual bristles. Credit Fraunhofer IWM Usage Restrictions None 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.