The 5-year survival rate for oral cancer (66%) is still one of the lowest among major human cancers, and delayed diagnosis until an advanced stage is thought to be the main factor contributing to this low survival rate. The detection and diagnosis of oral cancer is currently based on clinical visual examination and histopathological evaluation of a biopsy specimen. In response to the need for early detection of oral cancer, several diagnostic adjuncts have been developed and sold commercially over the years, including vital tissue staining, brush cytology, light-based visualization adjuncts, and the most recently developed test for salivary biomarkers for oral cancer. The purpose of this article is to review the current knowledge and research regarding these diagnostic adjuncts developed for early detection of oral cancer. Clinicians are best served by an awareness of the advantages and disadvantages of each adjunct, and to always consider and correlate with the clinical findings when interpreting the test results from these adjuncts.
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