As you have sub mucous fibrosis
,I do not think any surgery is there.
Some times local injection of cortizone is given but its efficacy is doubtful.
But for gradual improvement of sub mucous fibrosis is there,do following things.
1,remove the cause like gutkha chewing,tobacoo chewing etc.
2,use gargles of feel fresh,or listerine
3,Do daily exercise of widely opening of your mouth and closing,10 mnt in the morning and in the evening.
Ok and bye.