Where a wisdom tooth is extracted depends on impaction and nerve proximity
A fully erupted third molar and two impacted lower ones send you to different places from the outset. What divides them is how deeply the tooth sits in bone and how close it lies to the inferior alveolar canal or the maxillary sinus.
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Wisdom tooth extraction divides between what a general dental clinic handles and what warrants oral and maxillofacial surgery or referral, according to impaction depth and proximity to the inferior alveolar canal or maxillary sinus.
“It has to come out” is common advice. Where it should come out is where people get stuck, because the criteria separating a local clinic from a hospital are not set out anywhere.
What divides the cases
| Condition | Direction |
|---|---|
| Erupted upright and fully exposed | Simple extraction |
| Angled, or half covered by gum | Incision and sectioning |
| Deeply impacted in bone | Surgical approach |
| Lower — close to the inferior alveolar canal | Nerve injury risk assessment needed |
| Upper — close to the maxillary sinus | Sinus perforation risk assessment needed |
Third molars generally erupt between ages 17 and 25. Insufficient jaw space often leaves them angled or buried in bone, where they can produce caries or gingival inflammation on the adjacent molar. Not all of them need to come out — one that erupts upright, occludes properly and can be brushed is sometimes left alone.
What labelling establishes
Checking six clinics near Nowon Station on 12 August 2026 against clinic information and HIRA filings, two of six listed oral and maxillofacial surgery as a department. Department listing is a filed item and is worth noting where a surgical approach is likely.
It does not, however, settle suitability for an individual case. Impaction depth and canal proximity are established by imaging, and that assessment comes first.
How nerve injury is approached
For lower impacted teeth close to the inferior alveolar nerve, removing only the crown and retaining the roots — coronectomy — has been studied as an alternative that lowers the risk of nerve injury. It trades that risk for another consideration: retained roots can migrate over time, so follow-up is part of the plan. Which approach fits is decided on imaging and in consultation; this entry does not substitute for that.
From the source
Not every wisdom tooth has to be removed. One that erupts upright, occludes properly and can be reached with a toothbrush is sometimes left in place. (…)
Someone having a single upright wisdom tooth removed and someone with two impacted lower ones are looking for different places from the start.
— Six Nowon wisdom tooth clinics compared on oral and maxillofacial surgery listings (faqnfaq, 12 Aug 2026; in Korean)
Related literature
- Brudner B, et al. Intentional partial odontectomy and effect on inferior alveolar nerve injuries — a systematic review. Quintessence Int 2026;57(3):242-248. PMID 41716135 · doi:10.3290/j.qi.b6912877 → A systematic review of intentional partial odontectomy and its effect on inferior alveolar nerve injury.
- Mathew N, et al. Predicting and modulating root migration after mandibular third molar coronectomy — Umbrella review and proposed conceptual risk stratification model. Oral Maxillofac Surg 2026;30(1):77. PMID 42050075 · doi:10.1007/s10006-026-01560-6 → An umbrella review of predicting and managing root migration after mandibular third molar coronectomy.
Sources: clinic information and HIRA filings as checked on 12 August 2026 (per the source article). This entry offers no diagnosis or judgement on whether to extract; impaction and anatomical proximity are established by imaging and clinical assessment. Last checked 2026-08-24.
Frequently asked questions
Do all wisdom teeth need to come out?
No. One that has erupted upright, occludes properly and can be brushed is sometimes left in place. Extraction is considered when it lies angled against the molar in front, or sits half-covered with recurring inflammation.
What decides between a local clinic and a hospital?
Degree of impaction and anatomical proximity. How deeply the tooth sits in bone, and how close it lies to the inferior alveolar canal or the maxillary sinus, determine when oral and maxillofacial surgery or referral is appropriate.
How is nerve injury risk handled?
For lower impacted teeth close to the inferior alveolar nerve, removing only the crown and leaving the roots has been studied as an alternative that reduces nerve injury. The retained roots can migrate, so follow-up is required.