I have read that licking your wrist is the most effective method of checking your breath, because most of the germs that cause bad breath are on your tongue.
as for gum chewing and gas - tis true
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Swallowed air. Air swallowing (aerophagia) is a common cause of air in the stomach. Everyone swallows small amounts of air when eating and drinking. However, eating and drinking rapidly, chewing gum, using a straw to drink, smoking, and wearing loose dentures can cause some people to take in more air. Burping, or belching, is the way most swallowed air - which contains nitrogen, oxygen, and carbon dioxide - leaves the stomach. The remaining gas moves into the small intestine where it is partly absorbed. A small amount travels to the large intestine for release through the rectum.
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http://www.healthscout.com/ency/68/359/main.html