Wisdom Tooth Removal: Why a CBCT Scan Checks the Nerve

The roots of lower wisdom teeth sometimes lie very close to the inferior alveolar nerve, which gives feeling to the lower lip and chin. When a regular X-ray suggests this, a CBCT 3D scan shows exactly where the nerve runs, so the surgery can be planned to reduce the risk of numbness afterwards. Most wisdom tooth removals are routine. But lower wisdom teeth sit near an important nerve, and in some people the roots wrap around it or touch it. Damage to this nerve is uncommon, but it can cause numbness or tingling of the lip and chin, occasionally for a long time. A 3D scan before surgery helps the surgeon see the relationship clearly and plan around it.

Medically reviewed by Dr. Mukesh P. Chute, MDS · Last reviewed: 6 Oct 2026

The Nerve Near Your Wisdom Teeth

The inferior alveolar nerve runs through a canal inside the lower jaw, beneath the roots of the back teeth. It carries sensation to the lower lip, chin and lower teeth. Because wisdom teeth are the last teeth in the jaw and often grow at an angle, their roots can lie directly against this canal.

When Is a CBCT Scan Recommended?

Not everyone needs one. A routine X-ray is usually taken first, and a CBCT is advised when it shows warning signs that the roots and nerve are close.

The root appears to overlap the nerve canal
The nerve canal appears to narrow or bend around the root
A darkened band across the root where it meets the canal
Deeply impacted teeth, or teeth lying horizontally
Cysts or other changes around the wisdom tooth

What the CBCT Shows the Surgeon

A flat X-ray can only suggest that the root and nerve overlap; it cannot show whether they actually touch. The 3D scan shows the exact position of the nerve relative to each root, from every direction.

Whether the nerve runs beside, below or between the roots
How thin the bone between them is
The shape and number of roots
The safest way to remove the tooth, or whether to take a more conservative approach

How It Changes the Surgery

Knowing exactly where the nerve is lets the surgeon choose a technique that keeps away from it, for example by dividing the tooth and removing it in sections. In some cases where the risk is high, leaving part of the root in place deliberately may be safer than removing it. These are decisions best made before surgery, not during it.

Wisdom Tooth Removal at Our Clinic

At our Kothrud clinic, the whole process happens in one place: the X-ray or CBCT scan is taken in-house and reviewed with you straight away, and the surgery is planned and performed at the clinic. The CBCT scan fee is ₹3,800–₹5,000, depending on the scan required. If you are being treated elsewhere, the scan and report can also be shared with your own dentist.

Frequently Asked Questions

Does everyone need a CBCT before wisdom tooth removal?

No. Most people need only a routine X-ray. A CBCT is advised when the X-ray suggests the roots are close to the nerve.

What happens if the nerve is damaged?

It can cause numbness or tingling of the lower lip and chin. In most cases it is temporary and recovers over weeks to months, but rarely it can be long-lasting, which is why careful planning matters.

Can upper wisdom teeth also need a CBCT?

Sometimes. For upper wisdom teeth, the concern is the sinus rather than a nerve, and a CBCT can show how close the roots are to the sinus floor.

Can my dentist refer me just for the scan?

Yes. We can take the CBCT scan and send the report back to your dentist.

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For most people, wisdom tooth removal is straightforward. When an X-ray suggests the roots are close to the nerve, a CBCT scan turns guesswork into a clear plan, and that is the best way to reduce the risk of lasting numbness.

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