it's stupid. If only for the dental perspective. as mentioned before. diamonds are gonna wreak havoc on your upper teeth, since diamond is pretty much the hardest material on earth (which can be practically used due to amount needed) grinding them against bone will bring them down very fast
on a little note to what someone said. Diamonds might technically be considered brittle, in that they break and don't bend. But breaking diamond would require the kind of shear forces that aren't typically generated around a persons face. it would much earlier tear your jaw off or rip them bitches out of you gums before fracturing diamond
although I think the force excerted by kanye's ego that close to his body has never been measured so who knows.