We've all met them at one time or another. They're the close-talker. No matter how hard we try to back away and create some personal space, they just step forward to fill it. While this behavior creates extremely uncomfortable social situations, it is made even worse if the offender has bad breath.
The phenomenon of close-talking has become more and more culturally recognized. Television shows like Seinfeld and others have dealt with the problem. This speaks to the prevalence of the social malady.
Whether you are at a party or a more professional setting, close-talkers, especially those with bad breath, can throw off all social interaction. People become more concerned with how uncomfortable the situation is becoming than anything else.
If you find yourself in the position of interacting with a close-talker, the best thing to do may be to simply tell them that they are too close. Most of these people don't realize they are doing it, and no amount of backpedaling will give them the hint.
While you are on the topic, you may want to suggest that they look into specialty breath freshening products, such as those offered by TheraBreath. These products may help them fix their halitosis problem while they are working on giving people some more distance.