Why scurvy called sailors disease?

Scurvy is a disease that occurs in the mouth when the body lacks vitamins, specifically vitamin C. Before the invention of fridges and freezers and many other preservatives, there was no way to keep food from going bad other than salt (which admittedly, didn't work very well). Sailors often went on long journeys exploring or trading, and any fruits or vegetables they had would go bad long before being able to restock again.