The oral cavity manifests signs of various systemic diseases. This entails thorough examination of the oral mucosa, gingiva, teeth, tongue and other oral tissues. Occasionally, oral signs can be an expression of systemic conditions such as endocrine imbalance, nutritional deficiencies and blood disorders. Leukemia is a malignancy of white blood cells, which may result in significant morbidity and mortality. Oral changes maybe the first and only presenting features in leukemia patients, making it imperative for the dentist to diagnose the disease accurately.