21. It has been postulated that such events induce anxiety and cause increased jaw muscle activity. 22. This indicates that it had exceptionally strong jaw muscles . 23. Chewing something tough could cause a sore jaw muscle . 24. I have been so aware of that expectation that my jaw muscles have worked overtime. 25. He can't smile because his jaw muscles are gone. 26. Normal teeth would not be harmed, he said, but the jaw muscles might become overdeveloped. 27. Her jaw muscles were frozen, so a breathing tube couldn't be inserted into her trachea. 28. Count to 10, backward or forward, whichever relaxes the jaw muscles and assists in mental focus. 29. The rumbling sound can also be heard when the neck or jaw muscles are highly tensed. 30. The lower jaw is very deep, resulting in a lengthened moment arm of the jaw muscles .
