After the battle of Waterloo in 1815, scavengers removed the teeth from tens of thousands of dead soldiers for use in dentures. The so-called “Waterloo teeth” were in demand because they came from relatively healthy young men. – WTF Fun Facts
Source: Battle of Waterloo – Wikipedia
Medieval dentists had many of the same skill-sets as modern dentists. They could fill cavities, treat facial fractures, spot oral cancer, and whiten teeth. Additionally, they could make dentures out of cow bone and human teeth. – WTF Fun Facts
Source: https://www.nature.com/articles/4811723