Table 2.

Definitions for oral submucous fibrosis –

Year	Details
1966	Jens J. Pindborg and Satyavati M. Sirsat defined Oral Submucous Fibrosis as ‘an insidious chronic disease affecting any part of the oral cavity and sometimes the pharynx. Although occasionally preceded by and/or associated with vesicle formation, it is always associated with a juxta-epithelial inflammatory reaction followed by a fibro-elastic change of the lamina propria, with epithelial atrophy leading to stiffness’.
2019	Chandramani More and Naman Rao defined Oral Submucous Fibrosis as ‘a debilitating, progressive, irreversible collagen metabolic disorder induced by chronic chewing of areca nut and its commercial preparations; affecting the oral mucosa and occasionally the pharynx and oesophagus; leading to mucosal stiffness and functional morbidity; and has a potential risk of malignant transformation.’