Did you know that ancient Romans used to clean and whiten their teeth with urine? It might sound wild, but urine contains ammonia, which acts as a powerful cleaning agent. The practice was so common that even the poet Catullus wrote about it! While it might make us cringe today, this curious cleaning method was a go-to solution for oral hygiene back in the day. Who knew that such an unusual ingredient played a role in history’s quest for a brighter smile? 😁