Pretty sure you'd have to sedate the elephant. They like to keep their tusks! Since and elephant would never forget losing its tusks (pun intended), and they

Pretty sure you'd have to sedate the elephant. They like to keep their tusks! Since and elephant would never forget losing its tusks (pun intended), and they learn from each other, I speculate that it would get harder to do this over time. ...Not to say that we couldn't, I mean, we have technology--they don't.