Hello, Oral submucous fibrosis is a condition in which there is the formation of thick fibrous bands below the mucosa of cheeks and lips leading to stiffening and difficulty in mouth opening. It is a precancerous condition [although not cancer] and should be taken care of. It is commonly seen in individuals with tobacco and areca nut chewing habit. White appearance is due to blanching of the mucosa. It is difficult to regain the complete pink appearance. However, if you stop tobacco completely and also take proper treatment and exercise then the mouth opening will not get lesser. You need to consult an oral physician or a dentist and get evaluated. They can advise him to apply a steroid ointment in combination with hyaluronidase containing ointment to break fibers. Intralesional injections of steroid and hyaluronidase can be advised to be injected after every three to four days. Anti-oxidant like lycopene is also advised. Physiotherapy, like blowing cheeks, trying to open the mouth under pressure etcetera, can be demonstrated and advise to be done daily. Complete cessation of a habit of tobacco if you have chewing is a must. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora