While looking for moldable plastic material ("Sugru" and similar) on Amazon, I was a bit taken aback by the reviews for one such substance. Multiple reviewers were stating that they were using this stuff to make their own dental crowns or some other DIY tooth repair because they couldn't afford a dentist. I found this quite shocking and I'm not sure if these people were serious.
See the reviews on this product page: https://www.amazon.com/InstaMorph-Moldable-Plastic-6-oz/dp/B...