Halitosis

n. bad breath

Halitosis, oral malodor (scientific term), breath odor, foul breath, fetor oris, or most commonly bad breath are terms used to describe noticeably unpleasant odors exhaled in breathing – whether the smell is from an oral source or not.Halitosis has a significant impact — personally and socially — on those who suffer from it or believe they do (halitophobia), and is estimated to be the 3rd most frequent reason for seeking dental aid, following tooth decay and periodontal disease.
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Halitosis /hal·i·to·sis/ offensive odor of the breath. hal·i·to·sis n. The condition of having foul-smelling breath. Also called fetor ex ore. [more]Halitosis - Community and Resources

Noun
1. offensive breath
(hypernym) halitus, exhalation

n. halitosis, bad breath