Poor oral hygiene, gum disease, tooth decay
, or mouth infections can also be causes of halitosis. Smoking
or chewing tobacco-based products also can cause bad breath.
Medical conditions eg sinusitis
or respiratory infections can also cause bad breath
. I would suggest you to-
maintain oral and dental hygiene
. Use antibacterial mouth wash.
Get checked by ent doctor to rule out medical cause or if any medication required.
Hope this helps you.