I am working on my first character model for a animation class and I just noticed that while the polygons are there they seem to be see though in the viewport, anyone know why?
The only two things I believe its happening (which people already mentioned) is that or you lost your material or you made these faces hidden. Display -> Polygons -> Invisible faces. To unassign, go to the options of Edit Mesh -> assign invisible faces and then check on unassign.