Then he showed just a flash of white teeth under his mustache.

There was a flash of teeth in the black beard.

I couldn't make out his features very well, only the occasional flash of white teeth.

She turned to him, and he saw the flash of white teeth in the dark face.

"We certainly can't do it simply by looking at you," he said with another flash of teeth.

A flash of teeth in the dark face grinning up at me.

He smiled then, a quick flash of strong white teeth.

He smiled, a flash of white teeth in the dark features.

She smiled at him in a sudden flash of white teeth.

There was a flash of white teeth in his beard.