HELP !!! weird black "scars" on my face-model

I modelled a face with help from a tutorial but there are some weird black lines on it (they disappear in rendered image). Could you pls tell me how i can remove them ?!? :eek:


Try doing either Ctrl+N or Auto-Smooth button in the editing buttons. You can do both if you want also.

thank you !!! that was a very very fast and correct answer =) i start loving this forum xD ty !!!