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Oral Epithelial dysplasia(OED) is a relatively common premalignant condition, which affects approximately 2.5 to 5 per 1000 of population at any one time.¹ Dysplasia is a Greek word meaning abnormal atypical proliferation of tissues. Term dysplasia was introduced by Reagon in 1958 in relation to cells exfoliated from the uterine cervix, encountered principally in the epithelia.In past, epithelial dysplasia, epithelial atypia and dyskeratosis were used synonymously. Pindborg (1977) defined epithelial dysplasia as the term used for a lesion in which part of thickness of the epithelium is replaced by cells showing varying degree of atypia.