Latin has no word for “smile,” suggesting they did not smile as a social gesture that we know today. We smile as a greeting and to indicate a willingness to serve, and the Romans did not necessarily have this custom, no matter how ingrained it seems to us. But they could still have had the emotional smiles of pleasure and amusement. All I know is that the Romans often smiled in the old movie, “Quo Vadis?,” especially at Sophia Loren, who was a lowly extra back then.
Skeletons unearthed at Pompeii had tarter on their teeth, indicating Pompeii was a city of bad breath.