She gasped and her lips peeled away from her teeth.

His lips had fallen away from his teeth and he seemed to be grinning.

Her lips curled away from her teeth in a savage smile.

The blond man's lips crawled away from his teeth.

A slow smile drew Aurelia's lips away from her rather too pointed teeth.

Your gums may pull away from your teeth and not grow back.

Tom pinched his lower lip and pulled it away from his teeth.

El Hakim's lips pulled away from his teeth, exposing them.

He hissed the last words, his lips drawing away from his teeth.

I mean they pulled away from his teeth.