Wisdom tooth close to the nerve — CBCT assessment, coronectomy and managing numbness

Key facts

• The inferior alveolar and lingual nerves are most relevant
• CBCT shows the 3D relationship between roots and nerve canal
• Coronectomy may be considered when roots touch the nerve
• Numbness lasting beyond about 24 hours should be reported
• Altered sensation often improves gradually over weeks to months

Which nerves are involved?

Two nerves are most relevant to lower wisdom tooth surgery. The inferior alveolar nerve runs through a canal in the lower jaw beneath the tooth roots and gives feeling to the lower lip, chin, lower teeth and gums on that side. The lingual nerve runs on the tongue side of the jaw near the wisdom tooth and gives sensation and taste to the side of the tongue. If either nerve is bruised or stretched during surgery, temporary numbness, tingling or altered sensation can occur. Upper wisdom teeth are not near these nerves, but may be close to the maxillary sinus.

How CBCT assesses the risk

A standard panoramic X-ray can suggest that the roots are close to the nerve canal, showing signs such as darkening of the roots, narrowing or diversion of the canal. When these signs are present, a cone beam CT (CBCT) scan provides a three-dimensional view. It shows whether the canal passes beside, between or in direct contact with the roots, how thin the surrounding bone is and the shape of the roots. This allows the surgeon to estimate the risk more accurately, choose the surgical approach, and decide whether a coronectomy might be a safer alternative for that tooth.

Full removal vs coronectomy

In most cases, careful full removal is appropriate, sometimes sectioning the tooth into pieces to reduce pressure on the nerve. When the roots are intimately related to the nerve, a coronectomy may be considered: the crown of the tooth is removed, and the roots are deliberately left in the bone below the gum to avoid disturbing the nerve. The roots usually heal over with bone. Coronectomy is only suitable for teeth without infection in the roots or significant decay, and occasionally roots migrate upwards and need a second, usually simpler, procedure. Your surgeon explains the pros and cons for your situation.

Numbness of lip, chin or tongue after removal

Some temporary numbness is expected while the anaesthetic wears off over several hours. If numbness or tingling of the lower lip, chin or tongue persists beyond about 24 hours, contact the clinic so the surgeon can document the area affected and arrange follow-up. In many cases, nerve-related altered sensation improves gradually over weeks to months as the nerve recovers, although recovery can be incomplete in a small number of cases. Management may include monitoring, protecting the lip from accidental biting or burns, and referral for further assessment if needed. Wisdom teeth do not cause numbness of the head; such symptoms need medical evaluation.

Wisdom tooth near the nerve — assessment at Manhal in Dubai

At Manhal Medical Center in Dubai, Dr. Moataz Al-Khan, a specialist oral and maxillofacial surgeon and lecturer in oral surgery, assesses lower wisdom teeth with panoramic X-rays and 3D CBCT imaging when the roots appear close to the nerve. He explains whether removal is needed, the risks for your particular tooth, whether full removal or coronectomy is appropriate, and the recovery to expect. Surgery is performed under local anaesthesia; general anaesthesia is not offered at the clinic. You receive written aftercare and follow-up arrangements, in English or Arabic.

Wisdom teeth that lack space can become impacted, trapping food and causing infection, pain, or damage to the neighbouring molar. Surgical removal is planned with X-rays to protect nearby nerves.

Prepared by the Manhal Medical Center editorial team · Updated: 2026-10-18 · Treating specialist: Dr. Moataz Al-Khan

This page is general information and does not replace a consultation. Suitability, risks and results vary between patients.