Short-term bad breath may be associated with tonsillitis,
gastroenteritis,acid reflux, diabetic ketoacidosis, or sinus infection. Chronic halitosis may be caused by poor oral hygiene, gingivitis (gum disease),oropharyngeal infections or a dental abscess.
These antibiotics are useful only if bad breath is caused due to infections.If the cause is other diseases then antibiotics are not useful.
Hope it helps.Take care and pls do keep me posted on how you are doing.Kind regards.