Halitosis, or oral malodor, affects 50 percent of the adult population. Dental professionals can be a key resource for patients seeking treatment. It is important that dentists and hygienists are able to appropriately diagnose halitosis and understand the various etiologies that cause this condition before deciding on an individualized treatment plan. The aim of this article is to review the etiologies of and methods to diagnose halitosis. Various treatment options are described, including an individualized plan and indications for referral to other healthcare professionals.