Don't you hate it when employees you work with have bad ass breath every day. I just feel like putting a bottle of scope on there desk before they get to work with a note saying "here from your fellow co-workers".
Just tell them straight up ... slip it into a conversation
It could go sometihng like this
You: Hey Bob, how about the weather today?
Bob (aka assbreath): Yea I'm loving it, it's so nice and sunny outside
You: I can't wait until the summer. Damn I love the summer
Bob: So do I
You: you know what else I love?
You: Personal Hygiene
Bob - Looks confused
You: You know ... like having a shower and oh let's say brushing your teeth
Bob - Still looks confused
You: Think about it Bob ... think about it