For the most part, halitosis is caused by bad oral hygiene. So the first step is to make sure to brush your teeth and floss daily and see your dentist twice a year. But chances are your bad breath is not as serious as you think. A few simple lifestyle changes can help you avoid this problem. Cut back on alcohol-laden mouthwash, eat crisper vegetables, and scrape your tongue with a toothbrush every so often to live a fresh-breath-friendly life.