Jaw muscle spasms: The germ of tetnus produces a chemical toxin called tetanospasmin.Normal muscle action is maintained by a balance of chemicals that signal a contraction & release. This toxin takes over the message center, locking a muscle group in the contraction mode & preventing "relaxing" messages from getting thru. Occasionally localized, most often bodywide, it locks up the jaws like it does other muscles.
Answered 2/28/2018
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Tetanus: Because it causes severe hyper activation of your masetter muscle and therefore can not open mouth.
Answered 1/13/2013
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