Home Remedies for Bad Breath Bad breath is medically known as halitosis. Bad breath odors differ from individual to individual depending on the situations and the causes. Bad breath can cause obscurity in both your private and professional lives. The major causes are the following: Poor oral hygiene Usage of tobacco Strongly flavored foods like garlic and onions Deficiency of zinc mineral Medical situations like dry mouth, sinus problems, bronchitis, liver disorders, diabetes, kidney problems, other throat, nose and mouth