Full Breakdown
Neanderthal Dental Intervention at Chagyrskaya Cave: Earliest Evidence of Dentistry
5/14/2026, 1:52:12 AM
The Discovery: A 59-Thousand-Year-Old Drilled Molar
Archaeologists uncovered a lower second molar (designated Chagyrskaya 64) in the Altai-region Chagyrskaya Cave, southwestern Siberia. The tooth’s chewing surface bears a deep, irregular hole that penetrates the entire pulp chamber. Micro-CT and scanning-electron microscopy reveal microscopic radial grooves consistent with a rotary drilling motion performed with a fine-pointed stone tool. The specimen dates to roughly 59 ka, making it the oldest known example of invasive dental treatment.
Context: Chagyrskaya Cave and Neanderthal Life
Excavations at Chagyrskaya Cave since 2007 have yielded more than 70 hominin fossils, including 26 teeth, representing a Neanderthal occupation between 59 ka and 49 ka. Prior to this find, the earliest documented dental intervention was a 14 ka Homo sapiens tooth from Italy, leaving a 45 ka gap that the new evidence now bridges.
Researchers and Their Roles
The study, published in *PLOS One* (13 May 2026), lists Alisa Zubova (lead author, Russian Academy of Sciences) and Ksenia Kolobova (senior author, Institute of Archaeology and Ethnography, Siberian Branch) as principal investigators. Co-authors include John Olsen (University of Arizona), Lydia Zotkina (traceologist, same institute), and Andrey Krivoshapkin (Russian Academy of Sciences). Independent commentators cited include bioarchaeologist Rachel Kalisher (UC San Diego) and dental professor Justin Durham (Newcastle University).
Evidence and Experimental Replication
- Imaging: Micro-CT shows the cavity occupies the full pulp volume; SEM identifies concentric micro-grooves indicative of tool rotation.
- Tool analysis: Fine-pointed jasper perforators recovered from the same stratigraphic layer match the dimensions required for the marks.
- Laboratory test: Zotkina reproduced the procedure on three modern human molars using a replica jasper drill. The experiment produced identical geometry and micro-groove patterns within 35–50 minutes per tooth.
- Wear patterns: Post-procedure polish and continued occlusal wear demonstrate that the individual used the tooth for years after treatment.
Implications for Neanderthal Cognition and Care
The findings suggest Neanderthals could diagnose dental pain, select an appropriate lithic instrument, and execute a goal-directed, invasive procedure without anesthesia. Such behavior implies abstract causal reasoning, fine motor control, and social cooperation—traits previously attributed mainly to modern humans.
Official Statements & Responses
Zubova emphasizes that the tooth “represents the oldest evidence of interventional dental treatment in the world to date.” Kolobova notes the procedure required “diagnosing the source of pain, selecting an appropriate stone tool, and executing precise drilling with controlled finger movements.” Olsen describes the act as evidence of “a degree of cooperation between individuals” and of “manual dexterity” rarely documented in Neanderthals. Zotkina remarks that replicating the technique “required concentration and fine motor control, comparable to modern dental work.” Oxilia, not involved in the study, interprets the find as “a genuine milestone that pushes back the roots of invasive medicine by tens of thousands of years.”
Criticism & Alternative Interpretations
Kalisher acknowledges the hole is “certainly believable” as a stone-tool modification but cautions that the evidence “is not necessarily the smoking gun” for intentional dentistry. Benazzi (University of Bologna) warns that “the pain was probably severe enough that they attempted to remove the affected area by scraping it,” suggesting a less sophisticated intervention.
Conflicting Reports & Remaining Gaps
While the authors present a compelling case for deliberate drilling, some scholars argue the marks could result from post-mortem processes or accidental breakage. The exact cause of the cavity (bacterial decay versus trauma) remains unresolved, and it is unclear whether the procedure was self-administered or performed by another individual.
Verbatim Quotes
- “This discovery is the oldest evidence of interventional dental treatment in the world to date,” — Alisa Zubova, lead author, Russian Academy of Sciences
- “We have never encountered anything like this before — neither among Neanderthals nor among modern humans from much later periods.” — Alisa Zubova
- “It demonstrates that Neanderthals possessed abstract causal reasoning: they could connect a painful sensation to a hidden infection deep inside a tooth and devise a deliberate method to remove it," she said.” — Ksenia Kolobova
- “The procedure required diagnosing the source of pain, understanding that removing decayed tissue could bring relief, deliberately selecting an appropriate stone tool and executing precise drilling with controlled finger movements,” — Ksenia Kolobova
Future Directions
The team plans to test the molar for possible residue fillings (e.g., wax) and to apply their diagnostic framework to other Chagyrskaya specimens. Broader surveys may reveal whether this dental intervention was an isolated innovation or part of a wider Neanderthal medical repertoire.
