X-ray at the dentist

“In order to achieve maximum contrast in the images, the light-sensitive plate is set as closely as possible to the teeth. For this reason, […] flexible film is used. […] For the upper row of teeth the film is pressed onto the gums from behind; for the lower teeth it is inserted between the tongue and the alveolar process.”

Antoni Cieszynski, physician, dental surgeon and surgeon, 1913