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Triple image to illustrate terahertz pulse radiation as a medical imaging technique. The tooth at left is seen photographed by visible light, in the centre the yellow colour represents the enamel and the dentine area is green, whilst on the right, a cavity (pink) can be identified due to the way in which the terahertz wave is absorbed. Terahertz radiation is thought not to damage living tissue or DNA and is regarded as safer than X-ray radiation. The technology was developed at the Toshiba research unit at Cambridge, UK