Same goes with having something on your face. If I have something on my face and you tell me 30 min after you notice (and everyone else notices) then I will not be a happy camper.
Have a friend who has really bad breath. If anybody can suggest some tactful way to tell her without offending her too much, please let me know.
this may help: http://amirite.com/473933-we-re...r-feelings-its
also, don't do it in public and make sure no one else can hear you tell her