Some of the medical conditions, on the other hand, are liver cirrhosis, green discharges and stored mucus in at the back of the throat and tongue and in the nose and kidney problems. Another good symptom to use as a basis for self diagnosis of bad breath is the observance of yellow film covering the surface of the tongue. Foods such as cabbage, onion, and garlic are known to contain oil that runs to the bloodstream and makes us exhale bad odor. Coffee and soda are known to cause bad breath as well. All tobacco products can cause bad breath aside from other health danger they can cause. Dryness of the mouth is another reason why people have bad breath. Regular toothbrush cannot cover the entire surface area of your teeth so you need to use dental floss at least once a day and mouthwash. If possible, avoid commercial mouthwash that contains too much alcohol. Alcohol contributes to dry mouth. Dry mouth is where bacteria thrive most and bad breath begins. This will enable us to determine the things your child should avoid and the things your child should do to prevent the occurrence of bad breath. There are 4 major causes of bad breath in children: xerostomia, periodontal diseases, nasal infection, and poor oral hygiene. 1. Xerostomia (dry mouth). Dry mouth breeds bacteria. These occur temporarily though. It might be due to some foods or beverages you have taken recently or certain medications for which the by products of decomposition are emanating through your mouth. But, what if yours is a chronic condition? What would you do? For one, bad breathe would not have been there if you were careful enough to observe proper oral hygiene. While antibiotics are good options, they are seldom used in curing bad breath. This is largely because the sulfur-producing oral bacteria could in time, get immune with the effects of the antibiotics. Thus, you would only move from one does to another without truly alleviating the condition. Thus, you must go after long term cures.