Numbness from local anesthetic wears off within two to eight hours. If your lip or chin is still numb the next morning, the nerve that supplies it has most likely been bruised or stretched during surgery rather than cut. The large majority of these cases recover, most within weeks to a few months.
What matters now is reporting it, documenting it, and knowing which timelines signal a different conversation.
Which nerve, and what it controls
Two nerves run close to the lower wisdom teeth, and which one is involved determines what you feel.
The inferior alveolar nerve (IAN) runs through a canal inside the lower jaw, often directly beneath the roots of lower wisdom teeth. It supplies sensation to the lower lip, chin, and lower teeth on that side. Numbness here feels like a dental injection that never wore off — you can move your lip normally, you just can’t feel it.
The lingual nerve runs along the inside of the jaw next to the tongue. It supplies the side of the tongue, the floor of the mouth, and taste on the front two-thirds of the tongue. Lingual involvement affects tongue sensation and sometimes taste, and tends to be more intrusive day to day — tongue biting, difficulty with speech sounds, food feeling foreign.
Neither affects movement. If you can’t move your lip or your smile is uneven, that’s facial nerve involvement, which is different and should be reported immediately.
How common is this?
Uncommon, and overwhelmingly temporary.
A 2025 retrospective cohort of impacted lower third molar extractions found an overall neurosensory deficit rate of 7.3%, of which 5.5% were transient and 1.8% permanent. Older large series put permanent inferior alveolar deficit at around 0.6% and permanent lingual deficit around 1.1% at 18 to 24 months, from a prospective study of 3,236 patients.
A UK study tracking the same patients over time shows the shape of recovery clearly: lingual nerve disturbance was present in 15% of operated sides at 6 to 24 hours, 10.7% at 7 to 10 days, and 0.6% after one year. Inferior alveolar disturbance followed the same curve — 5.5%, then 3.9%, then 0.9%.
In other words: a lot of people notice something in the first day, and almost all of them are fine a year later.
The recovery timeline
| Time after surgery | What’s expected |
|---|---|
| 2–8 hours | Normal anesthetic wearing off. Longer-acting anesthetics can run 8–12 hours |
| 12–24 hours | Should be fully resolved. If not, report it — not an emergency, but it goes on the record |
| Days to weeks | Tingling, pins and needles, patchy sensation returning. Good sign — the nerve is recovering |
| 1–3 months | Most recoveries happen here. One series found recovery most significant at 3 months for the inferior alveolar nerve and 6 months for the lingual |
| 6 months | The key marker. One prospective study found symptoms resolved by 6 months in 92.3% of patients, and 98.1% by one year |
| Beyond 6 months | Spontaneous recovery becomes significantly less likely, and injury at this point may be considered permanent |
Returning sensation is usually unpleasant before it’s normal. Tingling, itching, electric sensations and hypersensitivity are all signs of a nerve regenerating, not of a new problem.
What causes it
Most of the time: proximity. The nerve sits close enough to the tooth that removing the tooth disturbs it. Pressure, stretching, retraction and inflammation around the nerve all produce temporary loss of sensation without the nerve being severed.
Factors that raise the risk:
- Radiographic overlap between the tooth roots and the IAN canal. Pell and Gregory Class C impactions, horizontal angulation and canal overlap were identified as independent predictors of nerve injury in patients aged 35 and over.
- Age. Older roots are more developed and bone is less elastic.
- The nerve being visible in the socket during surgery. Where the IAN bundle is exposed intraoperatively, reported paraesthesia risk is substantially higher.
- Lingual flap retraction. A randomised trial found lingual nerve damage in 9.1% of cases where lingual flap retraction was performed, versus none in the control group.
- Surgeon experience. Repeatedly identified across studies as one of the most influential factors in permanent paraesthesia rates.
This is a large part of why 3D imaging matters before lower wisdom teeth come out. A panoramic X-ray flattens a three-dimensional relationship; a CBCT scan shows exactly where the canal sits relative to the roots, and changes the surgical plan when it’s close — sometimes to a coronectomy, where the crown is removed and the roots deliberately left in place to avoid the nerve entirely.
What to do now
- Call the practice that did the surgery. Today if it’s been more than 24 hours. This isn’t about blame — it’s about getting a baseline recorded.
- Map it. Mark the numb area on a diagram or photo, and note whether it’s total absence of feeling, reduced feeling, tingling, or painful. Repeat weekly. The direction of change over time is the single most useful piece of information.
- Protect the area. You can’t feel burns or bites. Be careful with hot drinks, and watch for lip and tongue biting while chewing.
- Ask for review appointments. Mapped at intervals, not just “call if it doesn’t improve.”
- Ask about referral timing if there’s no improvement by around three months. Where surgical repair is being considered, the window matters — outcomes are better when intervention happens within months rather than years.
What doesn’t help
Massaging the area, taking high-dose vitamin B supplements, or waiting silently for a year hoping it resolves. None of these change nerve regeneration, and the last one forecloses options.
What is sometimes used, under supervision: a short course of steroids very early on where inflammation is suspected, and for persistent cases, medications for neuropathic pain if sensation returns as discomfort rather than numbness.
Common questions
Is numb lip the same as nerve damage?
Not necessarily. Most post-operative numbness is from bruising, stretching or swelling around the nerve, not from the nerve being cut. That’s why most of it resolves.
My tongue is numb and food tastes wrong.
That’s lingual nerve involvement, which carries taste fibres as well as sensation. Taste commonly returns alongside sensation.
Can it be fixed with surgery?
Microsurgical repair exists for a minority of cases, typically where the nerve has been transected. It’s considered when there’s no meaningful recovery over months, and timing affects outcome, which is the argument for early assessment rather than prolonged waiting.
Should I have had a CBCT scan first?
Not every lower wisdom tooth needs one. It’s indicated when a panoramic X-ray suggests the roots and canal are closely related — which is exactly the situation where it changes what gets done.
Does this happen with upper wisdom teeth?
Essentially no. The nerves at risk run in the lower jaw.
I’m numb and I also have severe pain. Is that related?
Possibly not — pain in the socket is more likely a separate issue. This guide to day-four extraction pain covers what worsening pain usually means.
