What Is an Impacted Tooth? Diagnosis and Treatment Options

An impacted tooth is one that has not erupted into the mouth normally — most often a wisdom tooth or upper canine. Dr. Cansu Öztürk explains how impactions form, when they need treatment, and the surgical and orthodontic options at GC Clinic.

What “impacted” actually means

A tooth is impacted when it has not erupted into the mouth at the expected time and is blocked by bone, gum, or another tooth. The most commonly impacted teeth, in order of frequency: lower third molars (wisdom teeth), upper canines, upper third molars, lower second premolars. Impactions can be partial (the tooth has emerged through the gum but not fully) or full (still buried under bone or soft tissue).

Why teeth get impacted

Modern human jaws are smaller than our ancestors’, and there is often not enough space for all 32 adult teeth. The wisdom teeth, which erupt last, often have nowhere to go. Upper canines impact for a different reason — they have the longest path of eruption (from high in the maxilla down to the arch) and can deflect off the lateral incisor root or get blocked by the first premolar.

Symptoms that indicate trouble

• Pericoronitis — gum inflammation around a partially-erupted wisdom tooth, with pain on biting and bad taste.
• Decay on the second molar — caused by food trapping against an impacted wisdom tooth.
• Cyst formation — dentigerous cysts develop around impacted teeth in 1–3% of cases.
• Crowding — when an impacted canine pushes the lateral incisor.
• Pain or swelling in the angle of the jaw.

Diagnosis at GC Clinic

Diagnosis combines clinical examination, panoramic X-ray, and CBCT for cases where the impacted tooth is close to the inferior alveolar nerve (lower wisdom teeth) or the canine root is unclear in 3D. CBCT is mandatory when we are planning surgical exposure of an impacted canine — guesswork is not acceptable when the wrong angle damages the lateral incisor root.

Treatment options

Three paths exist depending on the tooth and your situation:

• Surgical removal — most common for impacted wisdom teeth. Local anaesthesia, 20–45 minutes per tooth.
• Surgical exposure + orthodontic alignment — for impacted canines that can be saved. Combined oral surgery and orthodontic care over 12–18 months.
• Monitoring — for asymptomatic deep impactions with no pathology. Annual X-ray review.

What recovery looks like

For wisdom tooth removal, the first 48 hours involve mild swelling and discomfort managed with paracetamol and NSAIDs. We prescribe a chlorhexidine mouthwash from day 2. Sutures, when used, are usually resorbable and dissolve over 7–10 days. Most UK patients fly home 48 hours after surgery without issue.

Risks we discuss before any extraction

For lower wisdom teeth, the inferior alveolar nerve runs close to the roots. Temporary numbness affects approximately 1–5% of cases; permanent numbness, less than 1%. The lingual nerve risk is similar. We use CBCT to plan and section teeth conservatively to minimise nerve risk. We do not promise zero risk; we promise honest assessment and consent. Read more on when wisdom teeth need removal.

Frequently asked questions

Do all impacted teeth need to be removed?

No. An impacted tooth that is fully encased in bone, asymptomatic, and not causing damage to neighbouring teeth or cysts can often be monitored with annual X-rays. Removal is indicated when there is recurrent infection, decay risk to the adjacent tooth, cyst formation, or orthodontic interference.

How is an impacted tooth removed?

Under local anaesthesia (or sedation if requested), a small flap of gum is reflected, a small amount of bone is removed if necessary, the tooth is sectioned and elevated, and the site is sutured. The procedure takes 20–45 minutes per tooth. Recovery is 5–10 days.

Can an impacted canine be brought into the arch instead of removed?

Yes — this is a common orthodontic-surgical combination. The canine is exposed surgically, an orthodontic bracket is bonded to it, and a chain pulls the tooth into position over 12–18 months. This is preferred over extraction for upper canines because they are key to bite function and smile aesthetics.

Is impacted wisdom tooth surgery covered by NHS?

NHS removes impacted wisdom teeth when there is documented pathology — recurrent pericoronitis, untreatable decay, cyst, or damage to the neighbouring tooth. Asymptomatic impactions are not routinely removed on NHS following NICE guidance. Private removal is an option for symptomatic-but-not-severe cases.

Will I get dry socket after impacted tooth removal?

Dry socket affects approximately 2–5% of routine extractions and up to 30% of impacted lower wisdom teeth removed surgically. Smokers, patients on oral contraceptives, and those with previous dry socket are at higher risk. We use a chlorhexidine gel post-op rinse and provide a written aftercare plan to minimise risk.