What is the most polite way to tell someone that they have bad breath without being too offensive?

When it's one from my immediate family or it's my hubby then I'll frankly tell him he has one. We don't have to go around the bush - it's more important that they know than to hear other people complain about it. And that's how I'd also like them to approach me if I have (wait I'm checking now. LOL) Yea I think it depends on the proximity of that person to you - if she's a very close friend then the truth would come out from you easily and you know that you only mean helping her and she should not be offended. Nevertheless I agree with the suggestions above ;)