Hell-itosis
Let me tell you something…There's not much worse than having a conversation with someone whose breath is so bad it's as if they had a shit sandwich for lunch. Of all the pet-peeves I have, I think the one that bothers me most has to be bad breath.
It can come from anyone. Male, female, young and old. And it can range from the mildly unpleasant "just ate a spicy taco" breath to the eye-watering, paint-peeling death-breath that has you gagging and running for the door. Even my 2-year old gets mung-mouth on a regular basis and it can be so bad, particularly after his afternoon nap, that I've thought about giving him some Altoids.
I once had the unfortunate experience of working with a guy who didn't believe it was necessary to brush his teeth in the morning. "I brush my teeth before I go to bed. Since I don't eat breakfast, I don't have any food in my mouth until lunch time, so why do I need to brush my teeth before then?"
Because it smells like you licked the ass-end of a skunk, that's why.
If someone were to do a study, I wouldn't be surprised in the least if the results showed that the distance at which a person speaks to you is directly related to the grossness of their breath. Invariably, the person who feels it is necessary to speak to me at a distance of roughly 3 inches will also have breath so bad it's visible. And, of course, their story will likely be about "how high the helicopter hovered while honeymooning in Hawaii"
The thing of it is -- it can be prevented! So please do everyone a favour: Brush your teeth, chew gum and for cryin' out loud step back a bit!

