What Happens If a Dentist Hits a Nerve?

When a dentist injures a nerve during a procedure, the most common result is an altered sensation in your lower lip, chin, tongue, or gums that can range from temporary numbness to persistent tingling, burning, or pain. The two nerves most frequently affected are the inferior alveolar nerve and the lingual nerve, both branches of the trigeminal nerve that supply feeling to the lower face and mouth.¹ Most of these injuries resolve on their own within weeks to months, but a meaningful minority do not, and the difference between a quick recovery and a long-term problem depends on what kind of damage occurred and how it is managed.

How Dental Nerves Get Injured

People often picture a drill slipping and physically cutting a nerve, and that does happen, but it is only one of several ways nerves get hurt during dental work. The inferior alveolar nerve runs through a bony canal inside the lower jaw, and the lingual nerve sits in the soft tissue just behind the lower wisdom teeth with little protection. Their proximity to common surgical sites makes them vulnerable during several routine procedures.

The most frequently reported injuries are linked to dental implant placement and wisdom tooth removal, followed by local anesthetic injections themselves.² A large retrospective study of permanent lingual nerve injuries found that about 60% were caused by wisdom tooth removal and roughly 36% by local anesthesia alone.³ That second figure surprises many people. The needle used to deliver numbing medication can bruise, stretch, or occasionally nick a nerve trunk, and the chemical properties of certain anesthetic solutions may themselves be toxic to nerve tissue.⁴

Other mechanisms include compression from an implant post sitting too close to the nerve canal, stretching when tissue is retracted during surgery, thermal damage from a bur generating heat, and chemical irritation from materials like filling cements or irrigation solutions that seep into the canal. In rare cases, a second or even third nerve branch runs through an unexpected path in the jawbone, and the surgeon may not know it is there.⁵

What It Actually Feels Like

The symptoms depend on which nerve is involved and how badly it is damaged, but they generally fall into a few recognizable patterns. The most common experience is paresthesia, which refers to numbness, tingling, or a “pins and needles” sensation in the lower lip, chin, or tongue.⁶ If the inferior alveolar nerve is affected, you will typically notice it in your lower lip and chin on the side where the work was done. If the lingual nerve is involved, the numbness or altered feeling shows up on one side of the tongue.

Not all nerve injuries produce simple numbness. Many patients experience a mix of symptoms including ongoing or triggered neuropathic pain.⁷ These can include:

Hypoesthesia: reduced sensitivity, where you can feel pressure but it seems muted or distant.
Dysesthesia: unpleasant or abnormal sensations, such as burning or an electric-shock feeling, triggered by normal touch.
Allodynia: pain from something that should not hurt at all, like a light breeze on your lip or a sip of water on your tongue.
Complete anesthesia: total loss of sensation in the affected area, as if a dental injection never wore off.

Some people notice the change immediately after the procedure, while others report a delayed onset over several days or weeks as swelling develops around the nerve and presses on it.⁶ The delayed version can be particularly confusing because you may have left the office feeling fine.

How Severe Is the Damage?

Clinicians classify nerve injuries into three broad categories based on the extent of physical disruption, and the category largely determines your prognosis. The mildest form involves a temporary conduction block where the nerve fibers are bruised or compressed but structurally intact. Swelling inside the nerve sheath blocks signals for a short period. Sensation typically returns within a few days to a couple of months as the swelling resolves.⁸

The middle category involves actual damage to the nerve fibers themselves, but the surrounding sheath remains intact. Think of it like wires breaking inside an undamaged cable. The nerve can regrow along the intact sheath, though the process is slow. Signs of returning sensation generally appear within two to four months, with continued improvement over the following eight to ten months.⁸

The most severe form involves disruption of both the nerve fibers and their surrounding connective tissue layers, or complete severing of the nerve trunk. Recovery from this type of injury is never fully complete without surgical intervention, and there is a high likelihood of developing chronic pain or a painful lump of scar tissue called a neuroma.⁸ If no improvement at all has appeared by six to nine months, complete spontaneous recovery is unlikely.⁹

Early Treatment Makes a Difference

If you leave the dental office and your lip or tongue is still numb well past the time the anesthetic should have worn off, contact your dentist. The clock matters here. When nerve injury is suspected early, a short course of oral steroids prescribed within about ten days can help reduce the swelling that chokes off nerve signals and improve nerve cell survival.¹⁰ This approach borrows from the treatment of other nerve injuries like facial palsy and spinal cord trauma, where steroids have an established role in the acute window.

Beyond medication, monitoring the trajectory matters. If your sensation is gradually improving week by week, even slowly, that is a strong sign the nerve is regenerating and will likely recover. If sensation plateaus or never shows any improvement, that is a signal for further evaluation by an oral and maxillofacial surgeon or a specialist in trigeminal nerve injuries. A meta-analysis examining timing of surgical repair found that patients who had surgery earlier achieved a combined success rate of about 93%, compared with roughly 79% for those who waited longer.¹¹ Most experts recommend considering surgical repair when sensation has not improved at all by about three months after injury.¹²

When Surgery Is Needed

Microsurgery on nerves this small is delicate work and typically performed by oral and maxillofacial surgeons with specialized training. The specific technique depends on what they find when they explore the injury site. If the two ends of a damaged nerve can be brought together without tension and the gap is less than about 10 mm, the surgeon can suture the ends directly. Larger gaps require a nerve graft harvested from elsewhere in the body, often a sensory nerve from the leg or behind the ear.¹²

There is one important exception to the “wait three months” guidance: if a nerve is clearly severed during a procedure and the surgeon recognizes it at the time, the best approach is to repair it right then rather than waiting.¹² This scenario is uncommon, since most nerve injuries during dental work are not recognized as they happen. Consensus on the ideal surgical timeline remains an open debate in the field, but the trend in the evidence clearly favors earlier rather than later intervention when recovery has stalled.

Low-Level Laser Therapy and Other Non-Surgical Options

For milder injuries or as a complement to other approaches, low-level laser therapy has attracted interest. The idea is that specific wavelengths of light applied to the skin over the affected nerve can accelerate healing and nerve regeneration. Several case reports and small studies have shown meaningful improvement in sensation after repeated laser sessions. One study found significant acceleration in both the speed and degree of sensory return compared to baseline measurements.¹³ Case reports have documented patients regaining full sensitivity after courses of laser treatment following wisdom tooth extraction.¹⁴

The evidence here is promising but still limited to small studies and case reports rather than large randomized trials. Starting laser therapy early after injury may produce better results than waiting.¹⁵ Pain medications, including neuropathic pain drugs like gabapentin, are sometimes prescribed when the primary complaint is burning or shooting pain rather than numbness. A Cochrane review of treatments for these injuries found no strong evidence favoring any single intervention, reflecting how thin the high-quality trial data remains for this area.¹

The Chronic Pain Problem

When nerve injuries do not resolve, the consequences go well beyond an annoying tingle. Chronic post-surgical pain in the mouth and jaw is estimated to develop in roughly 4 to 5% of patients overall, but because such a large volume of dental procedures is performed every year, the absolute number of affected people is substantial.¹⁶ Relatively few clinicians are well-versed in managing this condition, which means it often goes poorly treated.

The quality-of-life impact can be considerable. Patients with lasting nerve deficits report significantly worse mental health, social functioning, and emotional well-being compared to controls.¹⁷ The areas most affected tend to be eating and enjoying food, socializing, and the ability to maintain a stable emotional state without becoming irritable.¹⁸ Oral health-related quality of life scores are also consistently worse in patients with nerve deficits, with older patients and those with more severe numbness tending to fare worst.¹⁷ ¹⁹

Lip and tongue numbness are not just sensory nuisances. A numb lip can lead to accidental biting and burns. A numb tongue changes how food tastes and makes it hard to detect food stuck between teeth. For some people, the chronic drooling that can come with loss of lip sensation is a source of embarrassment that makes them withdraw from social situations.

Which Procedures Carry the Most Risk

Wisdom tooth removal, particularly of lower impacted teeth, is the single largest contributor to dental nerve injuries. The lingual nerve runs so close to the surgical site that it is sometimes visible during the operation. Removing bone on the tongue-side of the tooth puts the nerve at particular risk, and one traditional approach involves placing a physical barrier between the bone being cut and the nerve to shield it.²⁰

Dental implant placement is the other high-risk category. The inferior alveolar nerve canal runs through the lower jaw, and implant posts that are too long or positioned too deeply can compress or penetrate it. Pre-operative imaging, especially cone-beam CT scans, has become standard practice to map the nerve’s exact location before placing implants. When a wisdom tooth appears to sit right on top of the nerve canal on imaging, some surgeons advocate intentionally leaving a fragment of root in place to avoid disturbing the nerve, rather than pursuing a complete extraction.²⁰ Recovery rates from injuries caused by these procedures tend to be lower than from other causes.²¹

Endodontic treatment (root canals) and procedures to remove cysts or tumors in the jaw can also injure nerves, but these account for a much smaller share of reported injuries.²

Informed Consent and Legal Considerations

Because nerve injury is a recognized complication of certain dental procedures, your dentist or surgeon has an obligation to tell you about the risk before you consent to the procedure. In practice, this step is sometimes skipped or inadequately documented. A review of malpractice claims in South Korea related to trigeminal nerve injuries after dental procedures found that the duty to inform the patient was breached in nearly 69% of cases.²² In France, an analysis of liability lawsuits over nerve injuries from dental implants found that 85% of the practitioners involved were found liable, with indemnification amounts averaging over €17,000 and reaching as high as roughly €43,000.²³

The legal picture varies by country, but the consistent theme is that courts take nerve injuries seriously, especially when patients were not warned. If you are scheduled for wisdom tooth surgery, implant placement, or any procedure in the lower jaw, you should expect a clear conversation about the possibility of nerve injury, its likelihood given your specific anatomy, and what happens if it occurs. If that conversation does not happen, ask for it.

What Regenerative Research Looks Like

Standard microsurgery can reconnect severed nerves, but regeneration remains incomplete in many cases. Researchers are exploring biological approaches to improve outcomes. One line of work involves stem cells harvested from dental pulp, the tissue inside your teeth. In animal studies, nerve gaps bridged with conduits containing dental pulp stem cells showed both structural and functional recovery, while control nerves with empty conduits did not recover.²⁴ More recent work has developed scaffold-free conduits engineered from these stem cells and their own natural matrix, designed to provide a guide for regrowing nerve fibers while delivering biological signals that promote healing.²⁵

These approaches remain in the laboratory and early preclinical stages. No regenerative therapy for dental nerve injuries is currently available as a standard clinical treatment. But the fact that functional nerve recovery has been demonstrated in animal models using cells sourced from teeth themselves is an appealing concept, since the donor material could theoretically come from the patient’s own extracted teeth, avoiding immune rejection. It will take years of clinical trials before any of this reaches a dentist’s office, but it represents a genuine shift from simply reconnecting nerve stumps toward biologically regrowing functional nerve tissue.

1
PubMed Central. Interventions for iatrogenic inferior alveolar and lingual nerve injury
2
PubMed Central. Assessing nerve injuries in oral surgery: a survey-based study on prevention and management
3
PubMed. Permanent lingual nerve injury after dental procedures: a retrospective study of 228 patients
4
PubMed Central. Paresthesia in dentistry: The ignored neurotoxicity of local anesthetics
5
PubMed Central. The clinical relevance of bifid and trifid mandibular canals
6
PubMed Central. Delayed paresthesia of inferior alveolar nerve after dental surgery: case report and related pathophysiology
7
Oral Surgery. Diagnosis, pathophysiology, management and future issues of trigeminal surgical nerve injuries
8
PubMed Central. Injury of the Inferior Alveolar Nerve during Implant Placement: a Literature Review
9
PubMed. Microsurgical repair of nerves injured during third molar surgery
10
Restorative Dentistry & Endodontics. Hypoesthesia after IAN block anesthesia with lidocaine: management of mild to moderate nerve injury
11
PubMed. Does early repair of trigeminal nerve injuries influence neurosensory recovery? A systematic review and meta-analysis
12
PubMed. Evidence-based outcomes following inferior alveolar and lingual nerve injury and repair: a systematic review
13
PubMed Central. Efficacy of low level laser therapy on neurosensory recovery after injury to the inferior alveolar nerve
14
PubMed Central. Laser therapy as treatment for oral paresthesia arising from mandibular third molar extraction
15
PubMed Central. Low-Level Laser Therapy in the Treatment of Inferior Alveolar Nerve Paresthesia After Surgical Exeresis of a Complex Odontoma
16
PubMed Central. Persistent Pain after Dental Surgery
17
PLoS ONE. Trigeminal Neurosensory Deficit and Patient Reported Outcome Measures: The Effect on Quality of Life
18
Oral Surgery. Quality of life following injury to the inferior dental or lingual nerve – a cross‐sectional mixed‐methods study
19
Nigerian Journal of Clinical Practice. Effects of Inferior Alveolar Nerve Neurosensory Deficits on Quality of Life
20
Cochrane Database of Systematic Reviews. Surgical interventions for the removal of mandibular wisdom teeth
21
PubMed Central. Neuropathy of Trigeminal Nerve Branches After Oral and Maxillofacial Treatment
22
PubMed. Trigeminal nerve injuries following dental procedures: A retrospective analysis of malpractice claims from 2016 to 2023 in South Korea
23
PubMed. Inferior alveolar nerve injury following dental implant placement: A medicolegal analysis of French liability lawsuits
24
PubMed. Regenerated Nerve Defects with a Nerve Conduit Containing Dental Pulp Stem Cells in Pigs: An Immunohistochemical and Electrophysiological Evaluation
25
PubMed Central. Enhancing facial nerve regeneration with scaffold-free conduits engineered using dental pulp stem cells and their endogenous, aligned extracellular matrix