I couldn't decide whether to address this in either the stropping or honing sections of the forum, and I do believe this a pretty noob-ish question - so I can't go wrong here. So here goes ---
After a period of time shaving, the edge of the razor degrades to where regular stropping won't fix some of the pulling and irritation associated with a degraded edge...
One could rehone the razor or perhaps touch it up with some chromium oxide...
I believe the basic rules are after one has touched up the razor with crox, one can extend the time between when the razor needs to be rehoned.
I'm just curious - Why couldn't one just keep touching the razor up indefinitely with crox? What happens to the edge that it requires a rehoning?