How to use "grin" in a sentence

She was proud, unable to bear the thought of appearing to be hysterical to a couple of macho cops who would grin at her and, later over doughnuts and coffee, make jokes about her

When she thought of clubbing him, he looked at her, and she saw his face: a fleshless skull with rotting skin stretched over the bones, burning red eyes, a yellow-toothed grin

I'm sorry, baby." His ingratiating, boyish grin was back

The yellow-toothed grin

The rotten, yellow-toothed grin