I do it when a guy comes and talk to my crush.. (only this particular guy tho cuz he is ask flirty flirty in front of my face with her..) And well I just look away and act like nothing.. But I been noticing I be clenching my jaw.. so I agree with the anonymous user who said it's a sign of anger..
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It also widens our face out a bit which makes some people look older/tougher. We also do it when we are really angry or annoyed.
It's a sign of anger. Could just be a habit as well, I have guy friend who clench his jaw every time he takes photos because that's just his pose. I've seen male models doing it.
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It's basic instinct and the origin of it is fighting. You clench your jaw and pull back your chin to protect yourself from damage by a punch. There are some really interesting videos about this and other "primitive" body language signs you can easily find on youtube.
Huh? They do it only when they are angry
Women clench their jaw when they're angry too...
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