Podcast:99% Invisible Published On: Fri Jan 27 2012 Description: Before the 1850s, dentures were made out of very hard, very painful and very expensive material, like gold or ivory. They were a luxury item. The invention of Vulcanite hard rubber changed everything. It was moldable, it could be precisely … Continue reading → Subscribe to SiriusXM Podcasts+ on Apple Podcasts to listen to ad-free new episodes and get exclusive access to bonus content.