PTtogether has given you the answers to the possible causes of this problem. Basically, your life is "upside down", suffering from chronic jet lag, having intestinal waste matter backing up from the colon into the chest and mouth, getting dehydrated, etc., etc. I suggest you through the guidelines for healthy living in my book Timeless Secrets of Health & Rejuvenation. It will help you quickly identify all the variuous reasons your body is decomposing foods, the main source of bad breath (unless it is from tooth or lung infections). Tooth decay also indicates that toxic waste matter is backing up into the stomach, chest, and mouth areas. It is important to keep the colon clean as well.