<s>[INST] hi doctor my mouth is not opening fully. Previously I was addicted to Guthkha (Tobacco) at that time my mouth was perfectly working but whenever i left chewing tobaco then after some day i felt that my jaws became block and i found problem for opening it... so is there any treatment to get my previous jaws....without any surgery or by surgery.......waiting for your reply... YYYY@YYYY [/INST] Hello thanks for consulting at Chat Doctor.difficulty in opening jaw is due to oral subducts fibrosis -potential malignant disorder, it is due to chew gut, please check with your oral surgeon, what stage is your OSF? It has medical line treatment if it is initial stage like antioxidants, if advanced it surgical mode f treatment,latest is stem cell treatment, please consult your plastic surgeon or oral surgeon asap,hope it helps,TC </s>