"At the same time the European diet grew a great deal sweeter as the use of sugar became more widespread. As a result, more and more people were having teeth pulled and needed replacements. This gave rise to “Waterloo Teeth”, which were real human teeth set into hand-carved chunks of ivory from hippopotamus or walrus jaws. The teeth were obtained from executed criminals, victims of battlefields, from grave-robbers, and were even bought directly from the desperately impoverished."
If you only read one passage on the rise of (horrifying) dentures in Victorian England today, let it be this one.