Many times I have said that vocal cord surgery could be very risky, because scar tissue does not vibrate the same way as healthy normal tissue. This is also the case with the lips of brass players. My brass teacher said to never have used on you an electric needle, to close a cut on the lips, as it would cause scarring and scar tissue does not vibrate the same way as healthy tissue. Listen and watch the video all the way through. Here is the evidence from "voice doctor":
http://www.youtube.com/watch?v=cUmnqUT20I4
