Telling a co-worker about his or her bad hygiene, such as bad breath or body odor, requires tact and civility.It is not a good idea to be direct or blunt.Instead,always drop hints and be anonymous.Simply leave a chewing gum or mint or a bottle of perfume on his/her desk.Or just leave a gift coupon of a dental appointment for oral prophylaxis.Bear in mind also, that some unfortunate individuals have a medical condition which makes their sweat glands work over time.Be more empathetic rather than embarrassing the individual.The important thing is to be able to talk to the person alone and privately. Proceed with extreme care and don't push the issue too hard. Start by saying that you care that is why you brought it up. Chances are that they don't even know they smell.Sometimes,it is beneficial to raise the issue of personal hygiene and public relation via inter departmental meetings.Encountering olfactory assaults is not harassment when approached correctly.