Thanks for using Health Care Magic. Read your query. Have you got your teeth professionally cleaned by your dentist? Bad breath can be due to a many various etiology .Since you are maintaining a good oral hygiene ,the cause of the bad breath can be other reason which can include dry mouth condition.Bad breath can also be caused by decreased flow of saliva called xerostomia. I would advice you to visit your dentist and have it evaluated.Avoid prolonged use of mouth wash which can also lead to dry mouth.Having your general health to check any systemic conditions like diabetes,throat infection ,salivary gland problems. Eat a diet rich in fruits and vegetables.Use of tobacco and smoking is to be avoided. Hope this was useful. Thanks and regards.