What is Saltpeter Used for?

Answer

Saltpeter is used for making toothpaste for sensitive teeth. Sometimes called sodium nitrate, it is found in explosives and can increase the shelf life of meats and other foods. You can find more information here: http://www.wisegeek.com/what-is-salt-peter.htm
1 Additional Answer
Saltpeter originated in the early 1900's. It was used as a gunpowder at first. Later, it was put in soldiers food to prevent them from having erections, keeping them highly focused on their task at hand.
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