Modelling problem: How to get rid of "Edgeless Edge" Okay, so when I'm modelling and making the general shape (or any shape) from my mesh, sometimes when I would form it into a certain way it would act like it was "inverted" or something and make this "Edgeless Edge". It shows no actual edge line. Is there anyway to get rid of these edges or faces? 

Pic for reference on what I mean below.

Thanks]1
It's probably the result of a highly non-coplanar face. 

In that case, the edge is of one of the triangles created not by you, but by the viewport renderer in the course of giving you a shaded image.You could make the edge explicit by hitting CtrlT - 'Triangulate Faces'.