Hi,
Thanks for asking the query,
Halitosis can be due to poor
oral hygiene, plague and calculus deposition, use of certain medications, ageing, chronic use of tobbacco, fasting or
starvation,
periodontal infection, tongue coating,
mouth breathing habit, xerostomia, oral pathological conditions, GIT disturbances, hormonal changes, nasal infections.
I would suggest you to get complete clinical examination done by a Physician and a
Dentist.
Go for symptomatic treatment of complete mouth scaling and polishing.
Use antiseptic mouthwash gargles twice daily.
Maintain a good oral hygiene, brush teeth twice daily.
Take a balanced diet, drink plenty of water and keep yourself hydrated.
Also get a blood examination done to look that you are diabetic or not.
Hope this helps out.
Regards...