like my chin is a bit long...and a dentist told me it was not supposed to be like that and that is grew abnormally because of i forgot why..i think because is some bone placement thing idk and i get pains in my jaw because of it.... if i got a chin job to fix this would it be a sin...and i also if i do it i would feel more comfortable.. would it be a sin?
If the pain is too much to bear, then no, it's not sinful. However, if you were getting it because you're unsatisfied with your looks, then it is a sin.
No, correction surgery is fine in my opinion, think of it like this: Imagine if one of your legs were shorter than the other and by correcting this it would make the rest of your life better..
Just remember when you die you spirit will look like your body without the plastic surgery, also your resurrected body will do the same. If if is a fault is will be corrected to perfect.