Genre Image (IMAGE) Umea University Caption In the above x-ray image, the white dotted line indicate the normal jawbone level at a molar site in the lower jaw. The individual has periodontitis and has therefore lost jawbone support (red line). The bottom x-ray image shows a foot with typical bone destrguction (red arrows) typical for rheumatoid arthritis. Credit Pernilla Lundberg and Solbritt Rantapää-Dahlqvist Usage Restrictions Umeå University 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.