Why Dentists Get Sued: The Missed Oral Cancer and the Nerve That Never Came Back

By John Mahoney · June 2026 · 8 min read

Dental malpractice is one of the most common professional-liability exposures in healthcare and one of the easiest to misvalue. Most dental claims are procedural and recoverable — a failed crown, a retained root, a tooth that should not have come out — that are common but pay modestly. A much smaller group of claims is catastrophic — a missed oral cancer, a permanent nerve injury, an odontogenic infection that became sepsis, a child who died under sedation — and those carry the highest payouts in dentistry by a wide margin. An attorney who treats every dental intake the same way will overvalue the routine files and underestimate the rare devastating one. This guide explains where dental liability actually lives, the cannot-miss failures behind it, and what separates a strong case from a weak one — for plaintiff and defense med-mal attorneys.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. The patterns below draw on closed-claims and insurer datasets that span different eras and definitions; treat them as directional, verify against the controlling jurisdiction, and value any individual case on its own record.

The Frequency-and-Severity Reality

By frequency, dentistry is a high-volume liability specialty. Dentists are sued more often than physicians in most reporting, both because the procedural nature of the work generates a steady stream of discrete adverse outcomes and because a single failed restoration or extraction is a visible, concrete event a patient can point to. The vast majority of these are routine quality-of-care disputes — ill-fitting crowns and bridges, failed root canals, post-extraction complications — that resolve for modest sums or no payment at all.

Severity is where dental claims split sharply. The everyday procedural file is low-to-medium value, but a small cluster of allegation types carries the catastrophic payouts: failure to diagnose oral cancer is the single highest-severity dental claim, and permanent nerve injury, deep-space infection, and sedation deaths follow close behind. Missed-oral-cancer cases in particular are commonly reported among the costliest dental indemnities because the delayed diagnosis converts an early, curable lesion into advanced, disfiguring, or fatal disease. The screening lesson is that two valuation models live inside this one specialty, and you must route every intake to the right one immediately.

The Dominant Allegation Types

Dental claims cluster into a high-frequency procedural group and a high-severity catastrophic group, plus a consent thread that runs through both:

• Extraction and oral-surgery complications — one of the largest categories by count: wrong-tooth extraction, retained roots, mandibular fracture, and displacement of a tooth or root fragment into the maxillary sinus or fascial spaces.
• Nerve injury — inferior alveolar and lingual nerve injury producing paresthesia or painful dysesthesia, arising from extractions (especially third molars), implant placement, and local-anesthetic injections.
• Endodontic (root canal) injuries — separated and retained instruments (broken files), root perforation, over-instrumentation, and sodium hypochlorite extrusion (the "hypochlorite accident").
• Failure to diagnose — the high-severity group: missed or delayed oral and oropharyngeal cancer, and undiagnosed or undertreated periodontal disease.
• Infection mismanagement — failure to recognize and treat a spreading odontogenic infection, leading to Ludwig's angina, deep-space infection, sepsis, or osteomyelitis.
• Sedation and anesthesia complications — respiratory and cardiac events and deaths, with pediatric sedation a particularly devastating subset.
• Lack of informed consent — central to nerve-injury, extraction, and implant claims where the realized risk was foreseeable and undisclosed.

The structural point: by count, dentistry is a procedural specialty, but by dollars, the diagnostic and catastrophic claims dominate. Any intake should be triaged first on which side of that line it sits, because the merit analysis, the experts, and the damages are entirely different.

The Cannot-Miss Conditions and Failures

The conditions and failures that drive dental litigation are:

• Oral and oropharyngeal cancer — missed, delayed, or not biopsied. This is the highest-severity exposure. The recurring failure is a persistent ulcer, white or red patch, or non-healing lesion that was observed but never biopsied or referred, allowing an early curable cancer to advance. A failure to perform routine oral-cancer screening, or to document and follow up a suspicious lesion, sits at the center of these cases.
• Permanent inferior alveolar or lingual nerve injury — paresthesia or dysesthesia from third-molar extraction, implant placement, or injection, especially where pre-operative imaging warned of proximity to the nerve canal and the risk was neither mitigated nor disclosed.
• Extraction errors — wrong-tooth extraction, retained roots left without disclosure or follow-up, mandibular fracture, and displacement of a tooth or root into the sinus or a fascial space.
• Endodontic injuries — separated files left in situ without informing the patient, root perforation, and the hypochlorite accident, where irrigant extruded beyond the apex causes severe tissue necrosis.
• Spreading odontogenic infection — failure to recognize escalating swelling, trismus, dysphagia, or airway compromise and to refer or hospitalize, allowing progression to Ludwig's angina, deep-space infection, sepsis, or osteomyelitis.
• Sedation and anesthesia events — inadequate monitoring, dosing, or rescue capability, with pediatric sedation deaths the most catastrophic and scrutinized subset.

For the diagnostic side, the single most actionable screening question is the closed-loop question: was a suspicious oral lesion documented, biopsied or referred, and tracked? An oral-cancer claim very often turns on a screening-and-referral failure rather than a misread under the microscope. For the procedural side, the decisive questions are whether the imaging warned of the nerve, what the consent disclosed, and whether the complication was promptly recognized and managed.

The Contributing Factors That Drive Payouts

Across dental closed claims, the recurring contributing factors are:

• Clinical judgment / diagnostic process — the costliest factor: failure to screen for, biopsy, or refer a suspicious oral lesion, and failure to recognize a spreading infection. These drive the high-severity oral-cancer, sepsis, and Ludwig's-angina claims.
• Technical skill / improper performance of a procedure — the most common error category by count: wrong-tooth and traumatic extractions, separated files, root perforations, implant malposition and sinus perforation, and nerve injury during surgery.
• Informed consent and risk disclosure — a distinctive dental amplifier. Permanent nerve injury, retained roots, and implant complications are frequently foreseeable risks, so a consent record that did not disclose them reframes an accepted complication as actionable harm.
• Failure to refer and to recognize escalation — not referring a lesion to an oral surgeon or ENT, not escalating a worsening infection to a hospital, and not obtaining or heeding pre-operative imaging near the nerve canal.
• Documentation — incomplete records of oral-cancer screening, lesion descriptions, consent discussions, radiographs, and sedation monitoring that weaken the defense and convert a defensible event into a paid claim.

Two of these are dentistry-specific levers. The first is the informed-consent amplifier: because nerve injury, retained roots, and implant complications are known, foreseeable risks, the case often turns less on whether the complication occurred than on whether it was disclosed in advance. The second is the screening-and-referral record: in a missed-oral-cancer or runaway-infection case, the line between a defensible file and a paid claim is frequently whether the chart shows the lesion or the swelling was identified, documented, and acted on. Documentation rarely creates liability here, but it consistently decides whether a claim is paid.

Strong Case vs. Weak Case in Dental Malpractice

The same factors grade the file, and the framing is useful to both sides.

What makes a dental case strong (plaintiff) / dangerous (defense)

• A persistent oral lesion noted in the chart over multiple visits that was never biopsied or referred, followed by a later diagnosis of advanced oral cancer — a clean screening-and-referral failure with a strong loss-of-chance causation theory.
• A permanent inferior alveolar or lingual nerve injury where pre-operative imaging showed nerve proximity, the risk was not disclosed in the consent, and no alternative or referral was offered.
• A spreading odontogenic infection with documented escalating swelling, trismus, or dysphagia that was not promptly referred or hospitalized before progressing to Ludwig's angina or sepsis.
• A wrong-tooth extraction, a separated file concealed from the patient, or a sedation event with absent or deficient monitoring records.

What makes a dental case weak (plaintiff) / defensible (defense)

• A documented oral-cancer screening with timely biopsy or referral and recorded follow-up — the closed loop intact.
• A nerve injury or retained root that was a disclosed, known risk with thorough documented informed consent, framing the harm as an accepted complication rather than negligence.
• A patient whose record shows declined treatment, missed follow-up, or non-adherence (such as ignoring instructions to seek care for worsening swelling) that drove the bad outcome.
• A procedure performed and monitored to the standard of care with documented imaging, consent, technique, and — for sedation — complete monitoring and rescue records.

Dental malpractice rewards a fast triage. On the diagnostic and catastrophic side, the case lives or dies on the screening-and-referral closed loop and the loss-of-chance causation chain for the missed cancer or untreated infection. On the procedural side, it turns on the pre-operative imaging, the consent that disclosed the foreseeable risk, and how promptly the complication was recognized and managed. Whichever side you are on, grading the file means matching the right model to the right claim and pressure-testing the expert who will carry it.

Bottom Line

Dentists get sued frequently, and most of the claims that come are procedural, routine, and modest in value. But the specialty hides a sharp severity spike: failure to diagnose oral cancer is the costliest dental claim, and permanent nerve injury, runaway odontogenic infection, and sedation deaths — especially in children — drive a disproportionate share of the catastrophic payouts. The cannot-miss facts are the un-biopsied persistent lesion, the nerve injury that imaging predicted and consent never disclosed, the swelling that should have been hospitalized, and the sedation that lacked monitoring. Whether you are screening these cases for the plaintiff or defending them, triage first to the right model — diagnostic or procedural — and grade the file on the screening-and-referral loop, the informed-consent record, and the documentation, not on the visible injury alone.

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