Teeth grinding was an action performed by some individuals. It could be involuntary or in response to a strong emotion, such as anger.

Rom ground his teeth every night, a habit Quark found detestable. (DS9: "Prophet Motive")

According to Harry Kim, after hearing the phrase "Live long and prosper" no matter what button he pressed on the security console, Tuvok ground his teeth so loud that it could be heard across USS Voyager's bridge. (VOY: "Revulsion")

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