The use of oral exfoliative cytology in clinical practice declined due
to the subjective nature of its interpretation and because there may
be only a small number of abnormal cells identifiable in a smear. The
more recent application of quantitative techniques, together with adva
nces in immunocytochemistry, have refined the potential role of cytolo
gy, stimulating a reappraisal of its value in the diagnosis of oral ca
ncer. This review considers the influence of the quantitative analysis
of cytomorphology, DNA analysis and other tumour markers applied to o
ral exfoliative cytological samples. These studies indicate that oral
cytology may provide an important adjunct in the assessment of the pat
ient with a potentially cancerous oral lesion.