Oral submucous fibrosis (OSMF) is defined as a chronic disease of oral mucosa characterized by inflammation and progressive fibrosis of lamina propria and deeper connective tissue layers. The pathogenesis of disease is not well established but is believed to be multifactorial. In India, first mention of this disease can be traced back to ancient literature of 'Shushruta' as 'Vidari'. However, in modern medical literature Schwartz 23 in 1952 first described it as “Atropica Idiopathica Mucosae Oris”. Pindborg in 1996 named the condition 'oral submucous fibrosis'and defined it as: A chronic progressive scarring disease of oral cavity and oropharynx characterized by epithelial atrophy and juxtraepithelial inflammatory reaction with progressive fibrosis of lamina propria and deeper connective tissue resulting in stiffness of oral mucosa and causing progressive decrease in mouth opening .