Quote taken from this question:
Allah has cursed those women who ... create a space between their teeth artificially to look beautiful
From the above quote, it seems that cosmetic orthodontic work for women is not halal. I found this page which talks about plastic surgery in general, but I'd like a more clear explanation.
Does the above generalize to both men and women? What are the major differences, if any, between sects?
I'm also interested in non-cosmetic surgery, but that's not the intent of the question.