Surely the ick is more random than that though. Often its something that was fine in someone else but with this particular person it's like a switch turning off, wasfibe yesterday but today its given you the ick and there is no coming back. Not liking manky teeth is something your not attracted to in the 1st place usually, not necessarily something that gives you the ick suddenly after a few months.
Many of the examples given are definitely things that have given me the ick in the past though.