Blocks ahead, a cab swung off the avenue and a passenger looked back, a permanent smile fixed on his face.

Now, in his own words, "I just sit up there with a permanent smile on my face".

He had a near permanent smile, showing off three gold teeth, a flashy anachronism.

And as in dolphins, its mouth is set in a permanent smile.

One side of her mouth was twisted up in a permanent caustic smile.

He had a permanent smile in his eyes, I thought, much as if he found the whole of life a joke.

The butler's permanent smile came up out of his crystal.

The assistant had a permanent smile affixed to her face.

The mouth, oddly and deceptively, seemed fixed in a permanent smile.

With a permanent smile on his face, he laughs at even the smallest exchanges.