Nerve Damage Risk in Wisdom Tooth Extraction Guide: Abnormal Sensation of the Inferior Alveolar and Lingual Nerves

The roots of lower wisdom teeth are often close to the mandibular canal, through which the lower jaw nerve passes, so nerve damage that dulls sensation in the lower lip or tongue can occur after extraction. The Korea Disease Control and Prevention Agency (KDCA, 질병관리청) explains that abnormal sensation after extraction appears in roughly 0.6 to 5%, that about 96% of inferior alveolar nerve cases and 87% of lingual nerve cases recover spontaneously, and that improvement usually comes within 1 to 2 months. However, it can last 9 to 12 months or fail to recover well, so dental examination and follow-up are needed from the start.

Published 2026-11-08 · Updated 2026-11-08 · DentalStatics editorial team

Key facts

Abnormal sensation after extraction	Roughly 0.6 to 5% (source: KDCA National Health Information Portal)
Occurrence by nerve	Inferior alveolar nerve about 2.6%, lingual nerve about 0.6% (source: KDCA National Health Information Portal)
Spontaneous recovery rate	About 96% for the inferior alveolar nerve and 87% for the lingual nerve (source: KDCA National Health Information Portal)
Recovery period	Usually within 1 to 2 months; may last up to 9 to 12 months or be hard to recover (source: KDCA National Health Information Portal)
Affected areas	Inferior alveolar nerve: lower lip, gum and lower jaw; lingual nerve: half of the tongue and loss of taste (source: KDCA National Health Information Portal)

Which nerves can be damaged by wisdom tooth extraction?

The KDCA explains that when a lower impacted wisdom tooth is removed, the inferior alveolar nerve, which handles sensation, and the lingual nerve, which handles sensation of the tongue, can be damaged, and rarely the sensory nerve of the cheek or paralysis of the facial nerve, which controls facial movement, can occur.

The roots of most wisdom teeth are very close to the mandibular canal, the passage through which the inferior alveolar nerve runs. So if the nerve is compressed or irritated during extraction, sensation may drop or a feeling that the anesthesia has not worn off may continue. It is uncommon, but the problem is that once it occurs it can last a long time.

What symptoms appear when a nerve is damaged?

When the inferior alveolar nerve is damaged, sensation in the lower lip, lower gum and skin of the lower jaw mainly becomes dull or tingly. When the lingual nerve is damaged, sensation in one half of the tongue drops and taste on that side may be lost.

If one lip or the tongue keeps feeling like someone else's flesh long after the anesthesia should have worn off, nerve damage can be suspected. In this case, do not wait for the next appointment; tell the dentist who did the extraction right away so follow-up can begin.

How often does it occur and how much recovers?

According to KDCA data, abnormal sensation after wisdom tooth extraction occurs in roughly 0.6 to 5%, about 2.6% from the inferior alveolar nerve and about 0.6% from the lingual nerve.

Spontaneous recovery is about 96% for the inferior alveolar nerve and 87% for the lingual nerve, and most return within 1 to 2 months. However, it may last 9 to 12 months or not recover well, so it is important to get a dental examination from the moment you first notice a problem and to record changes.

How is the risk of nerve damage checked in advance?

A panoramic X-ray shows the approximate position of the mandibular canal, and if the wisdom tooth roots are very close to or appear to overlap the canal, a dental CT checks the actual distance. The KDCA recommends discussing with the dentist whether to take a CT when the roots are very close to the nerve canal.

If the risk is judged high, the dentist may adjust the extraction method, or, if the tooth is deeply embedded and causing no problems, consider leaving it and monitoring. The KDCA explains that a small root fragment close to the inferior alveolar nerve with no inflammation can be left in place.

What should I ask before extraction?

Nerve damage is a complication that can occur even with care, so KDCA extraction guidance stresses that you should be informed beforehand. Checking the questions below at the consultation helps you understand the risks and alternatives.

How close the wisdom tooth roots are to the mandibular canal
Whether a CT is needed
What symptoms appear if a nerve is damaged and how it is monitored
What the option of not extracting and monitoring would involve
Whether referral to a higher-level facility or oral and maxillofacial surgery is needed

Common myths and facts

Myth: Nerves are often damaged when a wisdom tooth is removed.

According to KDCA data, abnormal sensation after extraction is roughly 0.6 to 5%, and most cases recover within 1 to 2 months.

Myth: Once abnormal sensation occurs, it never comes back.

Spontaneous recovery is reported at about 96% for the inferior alveolar nerve and 87% for the lingual nerve. However, some cases last long, so early examination and follow-up are needed.

Myth: Upper wisdom teeth carry the same nerve damage risk as lower ones.

The inferior alveolar and lingual nerve damage described by the KDCA is an issue in extraction of lower impacted wisdom teeth. For upper wisdom teeth, perforation into the maxillary sinus is considered more.

Frequently asked questions

If my lip is still numb the day after extraction, is it nerve damage?

If sensation has not returned after the anesthesia wears off, nerve damage is possible, so tell the dentist who did the extraction right away. The KDCA explains that examination and follow-up are needed from the beginning.

How long does it take for nerve damage to recover?

It usually recovers within 1 to 2 months, but it may last 9 to 12 months or not recover well. The degree of recovery is checked regularly at the dental office. Noting the area and dates where sensation returns makes it easier to compare changes at examinations.

Can taking a CT avoid nerve damage?

A CT shows the actual distance between the roots and the nerve canal and helps plan the extraction method. It can reduce the risk but cannot eliminate it entirely, so it is wise to get a full explanation before extraction. Also check the CT cost and whether it is covered before it is taken.

Could odd tongue sensation and taste also be due to wisdom tooth extraction?

If the lingual nerve is damaged, sensation in half of the tongue can drop and taste can be lost. Per KDCA data, abnormal sensation from the lingual nerve is rare at about 0.6%, but if it occurs, tell the dentist right away.

If the nerve damage risk is high, is it all right to leave the wisdom tooth?

If it is deeply embedded and there are no problems such as inflammation or cysts, it may be left in place and checked regularly. The risk of future problems and the risk of nerve damage are weighed and decided with the dentist.

References

Korean version →