Hi,
Thanks for asking the query,
Bad Breath can be because of various reasons,
Plague and calculus deposition , periodontal infections, tongue coating ,
xerostomia , faulty restorations retaining plague and bacteria , oral pathologic lesions , mouthbreathing habit, fasting and starvations, eating of food like onions , garlic
Diseases of GIT , GERD , Nasal infections like rhinitis,
sinusitis.
Pulmonary infections like
Bronchitis ,
pneumonia
Systemic conditions likediabetes ,
dehydration , fever.
Vist to a
Dentist and get checkup done .
Go for complete mouth scaling and polishing.
Drink lots of water .
Use
chlorhexidine mouthwash gargles twice daily.
visit to a GP and get checkup done.
Maintain a good oral hygiene .
Hope this helps out.
REGARDS...