Faces different colour - no material/texture

Somebody knows how i can fix this , that all of the head is in the same colour
because, if i go in texture paint, i can`t paint these black parts

I have assign only one material but no texture



thanks in advance

Remove doubles vertices (W / remove doubles)
Recalculate the face normals (select all faces and Ctrl+N).
Manually flip selected faces with W / Flip Normals

Recalculate the face normals (select all faces and Ctrl+N).

Thanks, that’s it