One of the most commonly repeated factoids about the ancient Romans is that they supposedly brushed their teeth with urine, because urine can be used to make teeth appear whiter. This factoid is usually presented to elicit feelings of shock and disgust. For instance, here is the introduction to an article by Nicholas Sokic titled “WFT: Romans used pee to whiten teeth,” published on the website Healthing on 29 January 2020:
“The Romans contributed greatly to civilization — roads, cement, aqueducts, the postal service — but not all of their creations lived to the present day, and some deservedly so. Ancient Romans used to use both human and animal urine as mouthwash in order to whiten their teeth.”
It is true that several ancient Roman and Greek sources do mention the use of urine to whiten teeth. None of these sources, however, portray this as a Roman practice. Instead, they unanimously and consistently portray it as a disgusting and barbarous practice associated with the Celtiberians, a group of Celtic peoples who lived in the central and eastern parts of the Iberian Peninsula. Furthermore, because there are no surviving Celtiberian records that confirm the alleged practice of using urine to whiten teeth, it is unclear how common this practice really was, or even whether it was something that the Celtiberians really did at all.
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