Halitosis is a symptom in which a noticeably unpleasant breath odor is present. It can result in anxiety and is also associated with depression and symptoms of obsessive-compulsive disorder. Halitosis can occur from oral and non-oral sources. Oral sources include certain foods, poor oral health care, improper cleaning of dentures, odor causing bacteria on tongue, periodontal disease, dry mouth, and consumption of tobacco products. Non oral sources include respiratory infection, infection of nose, windpipe or lungs, chronic bronchitis, postnasal drip, chronic sinusitis, diabetes, gastrointestinal disorder and liver or kidney disorder. Halitophobia: Some individuals have little or no mouth odor but still they feel like they have bad odor. This is Halitophobia. Prevention of Halitosis 1. Brush twice a day 2. Regular dental check ups 3. Use alcohol free antibacterial mouthwash 4. Consumption of plenty of water 5. Boosting the production of saliva 6. Dietary modifications