It would seem to me more to be that men just should not be vain, or imitate darchei nashim, who ARE accustomed to beautifying themselves while looking for more than a moment in the mirror. But if he is using it for purposes related to his own mitzvah – why not? And otherwise, why should a man not momentarily check his reflection to make sure that he is well-groomed before going out of the house. A talmid chochom is not supposed to be slovenly, and it just takes a second to check.
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