Impacted wisdom teeth: symptoms, risks and treatment options

What does "impacted" actually mean?

A tooth is described as impacted when it's unable to fully erupt into a normal, functional position, usually because there isn't enough space in the jaw, or because it's growing at an angle. Wisdom teeth are by far the most commonly impacted teeth, simply because they're the last to develop and often the last to run out of room.

Impaction isn't a single fixed pattern. Teeth can be impacted in several different orientations, and the type of impaction affects both symptoms and the complexity of any surgical removal.

Common symptoms of an impacted wisdom tooth

You may have an impacted wisdom tooth if you notice:

Persistent or recurring pain at the back of the jaw
Swelling or tenderness of the gum behind your last standing molar
A bad taste or odour, often linked to food trapping under a partially erupted tooth
Difficulty opening your mouth fully (trismus)
Swelling that extends towards your cheek or, in more significant infections, your neck
Pain that radiates towards your ear

Not all impacted wisdom teeth cause symptoms, many sit quietly with no issues for years. Problems tend to arise when a tooth is partially erupted, allowing bacteria and food debris to collect around it, or when it's pressing against the neighbouring tooth.

Why do impacted wisdom teeth cause infection so easily?

When a tooth only partially breaks through the gum, it creates a small flap of tissue over part of the crown. This space is very difficult to clean effectively, even with excellent oral hygiene, and becomes a natural trap for bacteria. The resulting inflammation, known as pericoronitis, is one of the most common reasons patients seek emergency treatment for wisdom tooth pain.

Risks of leaving an impacted wisdom tooth untreated

Not every impacted wisdom tooth needs to come out, but leaving a symptomatic one untreated can lead to:

Recurrent infections, sometimes requiring antibiotics

Damage to the root or bone support of the adjacent second molar

Development of a cyst around the crown of the unerupted tooth, which can cause progressive bone loss if undetected

Rarely, spread of infection into deeper spaces of the head and neck, which can become a medical emergency

This is why persistent symptoms shouldn't be ignored, even if the pain comes and goes.

How we assess impaction

Assessment starts with a clinical examination, followed by imaging, typically an X-ray, and in more complex cases a CBCT (3D) scan. This allows us to see precisely how the tooth is angled, how close it sits to the adjacent tooth, and critically, its relationship to the inferior dental nerve, which runs through the lower jaw close to the wisdom tooth roots.

This detailed picture is what allows a specialist to plan the safest surgical approach and give you an accurate, honest assessment of the risks involved in your specific case.

Treatment options

Depending on the assessment, options may include:

Monitoring - for impacted teeth causing no symptoms and low future risk, sometimes the safest approach is simply to keep an eye on things

Surgical removal - for symptomatic or high-risk impactions

Coronectomy (removal of the crown while deliberately leaving the roots in place) - occasionally considered in specific cases where the roots are very close to the nerve, to reduce the risk of nerve injury

We'll discuss which option is right for you based on your specific imaging, symptoms, and overall health; this isn't a one-size-fits-all decision.

What if I'm anxious about treatment?

Many patients delay seeking help for wisdom tooth pain because of anxiety about the procedure. If this sounds familiar, please don't let it put you off getting assessed. IV sedation is available for patients who would benefit from it, and our team is experienced in supporting nervous patients through the entire process, from first consultation onward.

Experiencing symptoms of an impacted wisdom tooth? Get in touch to arrange a specialist assessment.