Now that it's brought up, every time someone needs a disguise, they always use "surgical alteration". It's just not a big deal to the future. I always found it creepy. It's never explained how it's done. Do they get their faces mangled up, with the actual bits and pieces rearranged and scrunched up? Or is it a less creepy procedure, in which realistic prosthetics are stitched and mended to the existing face?