Nanoparticle-Hydrogen Peroxide Treatment Prevents Tooth Decay (IMAGE) University of Pennsylvania Caption An iron oxide nanoparticle applied to teeth prior to treatment with hydrogen peroxide effectively reduced the onset and severity of cavities (indicated with red arrows) in rats. Credit University of Pennsylvania Usage Restrictions In context of reporting 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.