Be careful it isn't anything serious. I remember hearing about lock jaw years ago where people can't move their jaw and need medical attention. I remember seeing it in an episode of A&E and while it wasn't a serious case it seems scary. This is on cdc when you Google "lock jaw" "People often call tetanus “lockjaw” because one of the most common signs of this infection is tightening of the jaw muscles. Tetanus infection can lead to serious health problems, including being unable to open the mouth and having trouble swallowing and breathing." Maybe get it checked out?