TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Brushing teeth. Thermogram of a woman using a toothbrush to brush her teeth. Thermography records surface temperatures by detecting the long-wavelength radiation emitted by an object. Here, the colour-coded temperature scale runs from white (warmest) through pink, red, orange, yellow, green and blue to black (coldest).
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