Halitosis, most commonly called bad breath, is a condition in which a person exits an undesirable odor from their mouth. It can cause anxiety associated with depression. It is considered a social problem associated deteriorative oral–hygiene or with oral–related disease, although it can sometimes be a result of systemic disease. The exhortation of dental practitioners for the treatment of this condition occurs with regularly since 90% of the breath odor problems from the oral cavity. This article provides an extensive review of the etiology, its prevalence, diagnosis and treatment strategies for the condition.