Yea I had it after some dental work for a root canal.
They called it a Trismus. Me thinks the old slang is lockjaw.
I really do feel your pain, it sucked big time!!!!!!
It hurt so bad and would not go away, I eventuallty had to do physical therapy to get it corrected. It worked though after about 4 visits it loosened up and all was good.
They used ultrasonics and heat then push and pull.
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