Table 5 More et al. 2012 classification of OSMF

Stage 1 (S1)

Stomatitis and/or blanching of oral mucosa.

Stage 2 (S2)

Presence of palpable fibrous bands in buccal mucosa and/or oropharynx, with /without stomatitis.

Stage 3 (S3)

Presence of palpable fibrous bands in buccal mucosa and/or oropharynx, and in any other parts of oral cavity, with/ without stomatitis.

Stage 4 (S4)

Any one of the above stages along with other potentially malignant disorders (e.g. oral leukoplakia, oral erythroplakia)

Any one of the above stages along with oral squamous cell carcinoma.

Functional staging

Interpretation

M1 Staging

Interincisal mouth opening up to or greater than 35 mm.

M2 Staging

Interincisal mouth opening between 25 and 35 mm.

M3 Staging

Interincisal mouth opening between 15 and 25 mm.

M4 Staging

Interincisal mouth opening less than 15 mm.