How Does Forensic Dentistry Identify Victims?

Forensic dentistry identifies victims by matching dental evidence taken from the remains against records created while the person was alive. A forensic dentist charts the teeth, restorations, and X-ray features found in the deceased’s mouth, obtains treatment records and radiographs from the dentist who cared for the presumed victim, and compares the two side by side. When enough features align without unexplainable differences, the remains are positively identified. INTERPOL recognizes dental comparison as one of three primary scientific identification methods, alongside DNA and fingerprints.¹

Why Teeth Work as Identifiers

No two mouths are alike. The combination of tooth shape, size, position, restorations, missing teeth, decay patterns, and anomalies gives every person a dental profile as distinctive as a fingerprint.² Even identical twins develop different dental histories once they start getting fillings, losing teeth, or wearing braces.

Teeth also survive when nothing else does. Enamel and dentin are the hardest substances in the body, and they resist fire, decomposition, and trauma far better than soft tissue. A person’s dental features change slowly after death, which keeps the evidence usable long after other identifying characteristics are gone.³

Examining the Remains

Identification usually starts at the morgue, sometimes at the scene itself. A forensic dentist examines the oral cavity and records every observable detail: which teeth are present, what restorations exist, any prosthetics such as dentures or implants, and unusual features like rotated teeth or jaw abnormalities. Photographs document the teeth before any manipulation that could alter their condition, and any removable dental work found with the remains is collected separately. Each item of evidence is labeled with an identification number, its anatomical site, and the date of examination.⁴

X-rays are central to the postmortem exam. The dentist takes intraoral radiographs of individual teeth and, when possible, panoramic films that capture the full mouth in one image. The important technical step is reproducing the same angles and magnification a treating dentist would have used, so the postmortem films can be laid directly against antemortem ones for comparison.⁴ Getting those angles right with remains that have limited jaw mobility sometimes requires removing soft tissue from the cheeks or floor of the mouth to insert the film.

Getting the Person’s Dental Records

The postmortem exam produces evidence, but that evidence only means something if there are lifetime records to compare against. Forensic dentists work with law enforcement and families to locate where the presumed victim received dental care, then request everything the office has on file: treatment charts, X-rays, photographs, and study models from past procedures such as fillings, extractions, root canals, and orthodontic work.³

Federal privacy law does not block this. HIPAA specifically allows dental offices and other healthcare providers to release protected health information to coroners and medical examiners for the purpose of identifying a deceased person, determining cause of death, or carrying out other legally authorized duties. No patient authorization is required.⁵ Medical examiner and coroner offices are not themselves covered by these privacy rules, which removes another potential barrier to information sharing.⁶

Comparing the Two Sets of Records

With both records in hand, the forensic dentist works through the postmortem findings feature by feature and lays them against the antemortem data. Each tooth position is checked. Is the tooth present or absent in both records? Do the type, material, and exact location of restorations match? Do the root shapes and bone patterns visible on X-ray line up?

Radiographic overlay is one of the most powerful techniques available. The forensic dentist positions a postmortem X-ray over an antemortem X-ray to see whether root lengths, filling outlines, and bone contours align. This is why matching the original angle during the postmortem exam matters so much; a film taken from a different angle will not overlay cleanly even when the teeth are the same.⁴

Matching Software

When investigators have a large pool of possible identities, software helps narrow the field. WinID, developed for use in North America, ranks potential matches by comparing coded dental and physical characteristics entered into a database. Forensic teams input data on restored surfaces, physical descriptors, and pathological findings for both the unidentified remains and the missing persons on file, and the software produces a ranked list of candidates.⁷ The software generates leads, not conclusions. Every computer-suggested match must be personally evaluated and confirmed by an experienced forensic dentist before an identification is made.⁸

Which Features Get Matched

Forensic dentists draw on a wide range of features, and the more distinctive ones a person has, the easier identification becomes.

Fillings, crowns, and bridges. These vary by material, shape, size, and exact position on the tooth. Two people might both have a filling on the same tooth, but the precise contour of that filling differs.
Root canals and implants. These procedures leave unmistakable signatures on X-rays. The shape of the filling material inside a root canal or the specific design of an implant screw can be matched precisely.
Missing teeth. The pattern of which teeth are absent, whether from extraction or because they never developed, contributes to the overall profile.
Tooth position and alignment. Crowding, spacing, rotations, and unusual positioning show up both visually and on X-ray.
Decay patterns. The location and extent of untreated cavities add identifying detail.
Bite relationship. How the upper and lower teeth meet when the jaw is closed varies from person to person.²

When Comparison Alone Cannot Answer the Question

The method has real limits. The biggest is the absence of antemortem records. Without a previous dental history to compare against, even the most detailed postmortem examination cannot produce a positive identification through dental comparison alone.² The problem is especially acute for victims who never received regular dental care or came from places where dental records are not routinely kept.

People who have lost all their teeth present a related challenge. With no teeth to compare, forensic dentists rely on alternative oral features like the ridges on the roof of the mouth, which are unique to each person but harder to match than dental restorations.

When teeth are present but records are not, teeth themselves become a DNA source. Dental pulp, the soft tissue inside a tooth, is shielded by enamel and dentin. That natural armor makes it one of the most reliable sources of DNA in forensic work, even after extreme heat or prolonged burial.⁹ DNA extracted from pulp can be compared against reference samples from family members or existing databases.

Teeth can also narrow the search when investigators have no candidate at all. A forensic dentist can estimate a person’s age from their teeth and shrink the pool of missing-persons reports worth reviewing.⁸ In children and adolescents this is fairly precise, because teeth develop and erupt on a predictable schedule. In adults it relies on gradual changes like enamel wear, secondary dentin buildup, and increasing root transparency, and results are less exact. Formulas calibrated on one population may not perform accurately on another.¹⁰

Reaching a Conclusion

A forensic dentist does not simply say “match” or “no match.” The American Board of Forensic Odontology uses standardized conclusion categories. A positive identification means the antemortem and postmortem data match in enough detail, with no unexplainable differences, to establish that the remains belong to a specific person. Below that threshold, a dentist may conclude that identification is possible but not definitive, that the evidence is insufficient to draw any conclusion, or that the remains can be excluded as belonging to the suggested individual.

The forensic dentist’s role is to provide an expert opinion on identity. Final legal certification typically rests with the medical examiner or coroner’s office, which weighs the dental findings alongside other evidence.³ The dentist compiles a formal report detailing the comparison process, the matching features observed, any discrepancies and how they were explained, and the conclusion reached. That report becomes part of the legal record and can serve as the basis for expert testimony.

1
INTERPOL. Disaster Victim Identification Guide 2023
2
PubMed Central. Dental Evidence in Forensic Identification – An Overview, Methodology and Present Status
3
American Board of Forensic Odontology. ABFO Body Identification Information and Guidelines
4
PubMed Central. Forensic Radiology in Dentistry
5
eCFR. 45 CFR 164.512 – Uses and Disclosures for Which an Authorization or Opportunity To Agree or Object Is Not Required
6
National Library of Medicine (PMC). HIPAA and Access to Medical Information by Medical Examiner and Coroner Offices
7
American Board of Forensic Odontology. WinID (Legacy)
8
PubMed Central. Forensic Odontology in the Disaster Victim Identification Process
9
Journal of Forensic Dental Sciences (via PubMed Central). Dental DNA Fingerprinting in Identification of Human Remains
10
PubMed Central. Dental Age Estimation Methods in Adult Dentitions – An Overview