Table 1.

Staging of oral submucous fibrosis [7]

Staging	Criteria
Group I (early)	Inter incisal distance greater than 35 mm
Group II (mild)	Inter incisal distance of 26–35 mm
Group III (moderate)	Inter incisal distance of 15–25 mm. Fibrotic bands are visible at the soft palate, pterygomandibular raphe and anterior pillars of fauces
Group IV (advanced) IVA	Inter incisal distance of less than 15 mm with extensive fibrosis of mucosa all over
IVB	Premalignant and malignant changes throughout the mucosa (histologically)

Khanna and Andrade [7] staging of OSMF