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Modalities All tissues fluoresce due to the presence of fluorescent chromophores (fluorophores) within them. The commonly fluorophores are NADH, collagen, elastin and cofactors such as flavins (FAD, FMN). FS can detect these substances and provide characteristic spectra that reflect biochemical changes within the tissues. There are three main ways to obtain fluorescence, autofluorescence (induced by UV light) Laser-induced and enhanced/dye which can be by either topical or systemic application of 5-aminolaevulinic acid (5-ALA). Dysplastic and malignant tissues, as well as having different spectral characteristics, tend to have increased red fluorescence and decreased green fluorescence. Therefore, significant increase in the red/green fluorescence ratio is an accurate predictor of dysplasia and malignancy.

Fluorescence spectroscopy in the detection of oral dysplasia