Is it possible to un-smooth a model other than to undo.

Maybe I'm doing this wrong, but at several points whilst altering the facial model I'm working on, I smooth the polys to get a feel of what the eventual outcome will looke like, can I from this point say, apply colours and tweak it a little to suit then un smooth it, back into polys to further the model?

I know I can smooth proxy which will leave me with the mesh and the smooth version, but I like to switch between wireframe and shaded modes, but this changes the smoothed model to either wireframe or shaded. when I switch between shaded and wire, I really want the smoothed version to stay as a shaded/rendered smooth model.

If you can understand all that I'll be impressed though if you can offer some kind of help and input it will be greatly received