Oral submucous fibrosis (OSMF) is a potentially malignant disorder (PMD) and crippling condition of oral mucosa. It is a chronic insidious scarring disease of oral cavity. pharynx and upper digestive tract. characterized by progressive inability to open the mouth due to loss of elasticity and development of vertical fibrous bands in labial and buccal tissues. https://www.kaliboat.com/product-category/industrialrestaurant-business-3/