The second two are more common uses of "wear off", but I think the first one is acceptable too in colloquial language. Probably it would not fit formal writing.
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Gene93As for the second sentence, can pain "fade away"?It's possible. However, it doesn't seem as common as "wear off".
Gene93I think that "wear off" has this negative connotation. Pain, the effect of something, numbness, can all wear off. I am getting the impression that it is always something unpleasant that wears off. Is that true in a way?Not always. Enthusiasm can wear off. Excitement can wear off. The beneficial effect of a drug can wear off. And so on.
wilpeterFor me, "wear off" or "has worn off" seems to fit temporary feelings--both good and bad. So enthusiasm, excitement, and antidotes to pain can wear off but love is more spasmodic.Did you mean less spasmodic?