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.