bare one's teeth
to reveal the true nature or colors completely. to reveal the ugly side of human nature.
People in Dogville bare their teeth. (bare one's teeth: change the word form when necessary.)
bare one’s teeth
to behave aggressively towards somebody; to vent anger on somebody; to scold.
Whenever there was a tiff between the husband and his wife, the wife, being a termagant, would bare her teeth. (In the phrase ‘bare one’s teeth, one’s can be replaced by an appropriate pronoun as required.)