See Here: Your Breath Stinks Every Morning Because Of This Repulsive Reason
It's warm and moist in there, but adding to their perfect venue are the dead cells and food particles left behind from your hard day's work. The old adage goes something like "what goes in must come out," and that fact doesn't change with bacteria. The terrible smells that wreak havoc near your head space every morning are generally coming from the waste products the bacteria produce. If you're not grossed out already, check out the video below for the full report. When you're done watching, you'll be running for your tooth brush.