hello, mouth opening can be restricted because of two reasons- first the soft tissue
(muscular or mucosa,etc) part , second the hardtissues ( bones) related to Tempromandibular joint/ jaw joint..
In India ,Oral Submucous fibrosis
is commonest due to gutkha, supari,spicy food chewing habits., it is characterized by loss of elasticity of cheek mucosa which hampers oral opening.. its treatment involves injections in cheek mucosa and sometimes surgery along with oral physiotherapy- forceful opening of mouth by certain exercises after medicines..
some muscular spasm also restricts opening but they are resolved as soon as muscles relaxes by medicines and do not persist for long period like 3 months mostly..
regarding temperomandibular joint- the problem in the articular space by its fibrosis due to trauma,autoimmune diseases of joints-arthrosis,arthritis
,etc can cause restricted oral opening.. for it the injections are given in joint spaces to resolve fibrosis.. and if it doesnt help then surgery is advised which is slight complicated.. so if the joint space responds to injectable treatments the surgery is avoided.. though it takes time but problem will resolve later on..
a proper clinical evaluation supported with few radiographs including OPG, TMJ
view (open and closed), MRI
of joint etc.. will help in reaching the correct diagnosis..
U can consult an oral medicine and diagnosis specialist along with an oral surgeon for treatment..
Meanwhile maintain oral hygiene
.. and follow all the instructionsexercises advised by the docs treating him..