SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Dental X-ray check-up. Historical advertisement for a dental substance called Sozodont showing a doctor examining an X-ray plate of a woman's healthy teeth. In the late 19th century, when this advert was produced, X-rays were known as Roentgen rays. X-ray equipment (at top left) produces X-rays which pass through the woman's jaw to give an image of her teeth on the photographic plate.
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