"As a chemist, I vouch for the fact that these are nanoscale razor blades. You can make brake pads from carbon structures, which last forever. This material has zero biodegradability. It stays in the body forever. Even if people donโt drop dead immediately, it cuts up the little blood vessels little but little."
https://www.connectingsingles.com/blog_120095_1/tiny_razor_blades.htm