Hi Shams, The condition of bad breath is called as halitosis. It is present in your case for 8 years; have you consulted doctor for this in past? There are many causes for Halitosis. 1] Poor oral hygiene (not brushing and flossing properly) 2] Gum disease : poorly fitting dental appliances, yeast infections of the mouth, and dental caries. 3] Eating certain foods like onions or garlic 4] Tobacco and alcohol products 5] Dry mouth (caused by certain medications, medical disorders and by decreased saliva flow during sleep hence the term morning breath ) 6] Systemic diseases such as cancer, diabetes, liver and kidney disorders. Cancers and metabolic disorders, can cause a distinctive breath odor as a result of chemicals they produce. Diabetes and kidney or liver failure can lead to a fishy smell. Uncontrolled diabetes can also cause a fruity breath odor from chemicals called ketones. Chronic reflux of stomach acids (gastroesophageal reflux disease, or GERD) has been associated with bad breath. In addition, some medications — such as those used to treat high blood pressure, psychiatric conditions, or urinary problems — can indirectly produce bad breath by contributing to dry mouth. So consult your doctor to find out in which category do you fit in and get treated. Take care. Best regards, Dr. Neelam.