Ancient Vietnamese Tooth Blackening Revealed

Recent research indicates that as far back as 2,000 years ago, individuals in ancient Vietnam were intentionally darkening their teeth with an iron-rich paste.

This discovery transforms a striking beauty tradition in the region from mere speculation into tangible evidence of cultural identity, preference, and chemical ingenuity.

Evidence from Skeletons

In northern Vietnam at Dong Xa, three sets of remains showed teeth with a deliberate dark coating that couldn’t simply be attributed to ordinary staining.

Archaeologist Yue Zhang from the Australian National University analyzed these samples and linked the dark coating to an intentional tooth blackening practice.

Two of the teeth dated back to the Iron Age, and a third was from around 400 years ago, indicating a long-standing custom throughout Vietnamese history.

This heritage makes the dark enamel harder to dismiss as a mere oddity and raises questions about the process that led to this unique coloring.

Ruling Out Betel Chewing

Betel chewing seemed like a plausible alternative explanation since previous studies had connected dark teeth in ancient Vietnam to betel residues.

However, those earlier stains were reddish-brown, unlike the solid black seen in the Dong Xa samples and other historically blackened teeth.

Moreover, chemistry from burial environments didn’t align either, as random soil exposure wouldn’t create the same iron-sulfur signals on different teeth.

Eliminating these possibilities pointed researchers toward a cosmetic mixture specifically crafted by individuals.

Ingredients for Tooth Blackening

The enduring quality of the black color likely came from tannins, natural compounds in plants that bond with metals, mixed into the paste.

When heated plant extracts combined with iron salts that dissolve and readily react, the resulting mixture turned strikingly dark.

Exposure to air solidified the process, as oxygen helped fix the pigment into a resilient black coating.

This chemical interaction also parallels why similar ingredients colored medieval inks and textiles, grounding the custom in chemistry.

The Elaborate Process

Vietnam’s complex methods didn’t stop with just one application of dye; the entire process could extend over 20 days.

Initially, artisans would roughen the tooth surface before layering on plant extracts, acids, and sticky substances over several evenings.

Polishing with ash or coconut tar likely provided the sleek finish that made the blackened teeth appear intentional and sophisticated.

This exhaustive method likely indicated both a commitment to aesthetics and a personal ritual.

Black Teeth as Identity Markers

Across Asia and beyond, tooth blackening has historically signified beauty, maturity, and a connection to humanity, according to a broad review.

Experts viewing the Dong Xa findings interpret them as strong evidence that this practice was prevalent and celebrated among ancient communities.

Piyawit Moonkham, an environmental archaeologist at Chiang Mai University, posited that the custom may have been a public spectacle during that time.

The Role of Iron

This tradition coincided with the increasing accessibility of iron tools, weapons, and possibly mines in northern Vietnam.

This was significant because iron utensils could leach their content into the heated plant mixtures, facilitating the darkening reaction.

“And sulfur is ubiquitous in nature,” Zhang noted, emphasizing that everyday materials could support this specialized cosmetic practice.

Longstanding Tradition

This was not a one-off anomaly; multiple Iron Age individuals linked to the Dong Son culture exhibited blackened teeth.

The findings revealed that at least one-fifth of the examined individuals showcased these dental color changes, with some studies suggesting the figure might be as high as 40%.

An even later burial dating back about 400 years also displayed the same black coating, indicating a custom that persisted rather than a temporary trend.

This evolution aligns with other research suggesting that older practices of tooth removal transitioned to less invasive marks of adulthood.

Considerations of Evidence

However, the analysis only involved three archaeological teeth, and preservation challenges required careful examination.

While two Iron Age teeth retained some sediment, the younger sample was already showing signs of degradation.

Fortunately, the methodology preserved most of the remains, allowing future researchers to analyze additional collections without damaging rare specimens.

Modern Connections

The findings from Dong Xa tie a vast historical heritage to contemporary practices still seen in parts of Vietnam.

Historical records depict tooth blackening as a meticulous craft that lasted into modernity until Western beauty standards began to overshadow it.

Some communities maintained this tradition far longer, preserving recipes that combine plant extracts, iron utensils, patience, and polishing techniques.

When viewed alongside ancient burials, this survival makes the custom a significant cultural continuity rather than an isolated novelty.

Blackened teeth now exist alongside bronze drums, graves, and historical texts as concrete evidence that bodily aesthetics carried genuine social significance.

More samples from Vietnam and surrounding areas may reveal whether this practice was localized, shared among people, or spread through ideas.

The findings appeared in Archaeological and Anthropological Sciences.