INTRODUCTION
Catullus’ invective against Egnatius,Footnote 1 jealous at his interest in Lesbia, is widely known from poems 37 and 39.Footnote 2 In poem 39, in particular, Catullus derides Egnatius for his incessant smiling, which he finds inelegant and distasteful: an unwavering grin remains plastered on his face regardless of the situation he finds himself in, whether a sombre trial, where the defence lawyer stirs the jury’s emotions, or a funeral, where a grief-stricken mother laments the loss of her only child.
In the second half of the poem, Catullus accuses Egnatius of an unconventional approach to oral hygiene: while the norm among Italic populations was to rinse one’s teeth with water, Egnatius apparently adhered to the Celtiberian custom of whitening one’s teeth with urine. Here I will focus on the peoples qui puriter lau[unt] dentes (l.14), giving particular attention to the mention of the Lanuvini:Footnote 3

If you were a Roman or a Sabine or a Tiburtine or a plump Umbrian or a fat Etruscan, or a black and toothy Lanuvian, or a Transpadane (to touch on my own people too), or anybody else who washes his teeth with clean water, still I should not like you to be smiling everlastingly.Footnote 4
Catullus is the only extant writer who characterizes the inhabitants of Lanuvium as atri atque dentati. This curious statement has not (to my knowledge) been addressed by any editor.Footnote 5 Among the rare scholars to comment on this passage is Wilhelm Kroll, who confines himself to the statement: ‘Wie Catullus dazu kommt, den Lanuvini dunklen Teint und gute Zähne zuzuschreiben, und was ihn veranlaßt, die Bewohner gerade dieser Stadt zu nennen, ist nicht klar … ’Footnote 6 It is indeed unclear why Catullus mentions the Lanuvini, and why he might characterize the ‘typical’ Lanuvian as ater atque dentatus. The first point (ater) is certainly the more difficult to decipher and I shall attempt to explain it in a second step. There may be a plausible explanation for the Lanuvian’s good teeth: the argument of the poem helps us to solve this little enigma, but the contribution of archaeology is indispensable.
OPEN YOUR MOUTH: CATULLUS AND EX-VOTOS
Two points can be deduced from Catullus’ passage: (1) the waters of the ager Lanuuinus were considered pure; (2) they were considered curative for afflictions of the mouth. There is, therefore, a clear link between the quality of the water of Lanuvium and its inhabitants’ ‘strong’ teeth. Yet it must be noted that nowhere else in the literary sources are such properties attributed to Lanuvian water. Catullus’ assertion is therefore of great importance because it agrees with ancient medical texts, where rinsing with cold water (preferably spring water) is confirmed as a means of preventing dental and more generally oral ailments.Footnote 7 Catullus’ reference thus seems not at all incidental, suggesting that it could be traced to a specific spring in the territory he knew of, or had visited himself. This is certainly possible, since Lanuvium was very close to Rome and a favoured destination of the city elites.Footnote 8
A possible confirmation of this hypothesis, which can also explain the ironic but good-natured description of the Lanuvini, comes from an important archaeological discovery made in the area. In 2012, in the locality of Pantanacci,Footnote 9 a suburban area north of Lanuvium but certainly within the boundaries of its ager, a rich votive deposit was found in a tuffaceous cave, in which there was a spring.Footnote 10 The richness of the deposit, despite years of plundering by clandestine excavators, demonstrates an extensive frequentation of the site that cannot be attributed to the local population alone. We can certainly affirm the existence of a cult connected to this spring, even if we cannot say more at present.Footnote 11
Among the numerous anatomical terracotta votive offerings found, a conspicuous number are peculiar and unique: ex-votos reproducing an open mouth, with tongue, lower teeth and uvula (Fig. 1).Footnote 12
Oral cavity ex-voto from Pantanacci (inv. IG147795); by the kind permission of Direzione Generale Musei Lazio, Museo delle Navi Romane, Nemi (Rome, Italy).

Their presence demonstrates that the water of this spring was believed to be beneficial for the treatment of oral ailments.Footnote 13
The chronology of the site, in use mainly between the fourth and second centuries b.c. but continuing throughout the Late Republican and Early Imperial periods, fits Catullus’ reference well. One can presume, therefore, that he was aware of this specific spring whose relation to dental care seems to have been established. It is not absurd to imagine that the Lanuvini were believed to be dentati because of this specific cult, one of many in the area.Footnote 14
WHY ARE THE LANUVINI CALLED ATRI?
We have explained why the Lanuvini were dentati, but it is more difficult to explain why Catullus calls them atri. This, too, may be related to water quality: Pliny shows that it was believed that certain waters made the skin darker.Footnote 15 Another explanation, purely conjectural, is that the Lanuvians’ skin was ‘black’ when they performed their ritual ablutions, because they were in the dark of the sacred cave, where the contrast with their bright white teeth made them seem all the darker.
While the immediate context suggests a literal reading of ater, it can also be used figuratively to convey moral darkness—wickedness, depravity or baseness—indicating potential for a metaphorical extensionFootnote 16 which could support a veiled critique of the rising Lanuvian elites, whose attainment of prestigious offices in Late Republican Rome exemplifies their growing political prominence.Footnote 17
To conclude, Catullus’ mention of the Lanuvini, despite appearing to be a minor and insignificant aside, contains multifaceted meaning. It reveals Catullus as an astute observer and satirist. In mentioning the Lanuvini, he preserves valuable information about local cults that are remarkably corroborated by local archaeological evidence. The connection he makes between Lanuvian water and dental health provides a unique glimpse into ancient health practices in this ancient city of Latium, of which we would otherwise know nothing.