hi you will need proper examination of your oral cavity of mouth opening is restricted due to your wisdom tooth infection (which is most common) or any other infection related to other teeth.
The other reason is, malaligned teeth, which could be causing problems in your Temporomandibular joint (the joint which helps you open and close your mouth)
The other reason could be the Temporo-mandibular joint problems , which could be due to some trauma that you might have had.
there could be a number of reasons for inability to open mouth fully . is the inability recent ? or is it present since a long time ? is it associated with difficulty in chewing ? a number of factors need to be evaluated along with a thorough clinical examination . please see a dentist for correct diagnosis and treatment .
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