I heard how not chewing your food causes poor digestion. Could bad breath be a result of that?

Possible. It is absolutely necessary to chew food properly before you swallow as digestion begins in the mouth, when food gets mixed with saliva.The food also is properly pulverised so that stomach acid & other enzmes of intestine can act upon the food more readily, & hence this process helps i n proper digestion.If the food is not digested properly, it backs up in the system, & when you burp, bad breath occurs.