Jaw shaving, because you can't technically "reattach" the jaw. It will have repercussion eventually, even if it's not visible ones. There are usually complications with healing that have long term effects not to mention it's very painful. A friend of a friend of mine can't chew properly, another girl I know can't sleep on her side anymore. Honestly jaw surgery was never meant to be a cosmetic procedure, in the west it's only done on people with severe underbite from what I know, and it's still really risky. I'd say nose and double eyelid is the least major, the former depending on if it's open or closed rhinoplasty. Agree that skin bleaching is dangerous and super unhealthy.
Where on earth are you living where people so often/casually are getting jaw shavings????