What is an impacted wisdom tooth?

Last updated on: 5 Aug, 2026

An impacted wisdom tooth is a tooth that cannot erupt normally and remains partially or completely trapped in the bone or beneath the gum. This most commonly occurs due to a lack of space in the jaw or the incorrect positioning of the tooth itself.

The condition is common and may be asymptomatic, but in many cases it leads to pain, inflammation and other complications if not diagnosed in time. That is why recognising it is an important part of maintaining good oral health.

In this article, you will learn what an impacted wisdom tooth is, what the main causes and symptoms are, when treatment is necessary, and how the extraction procedure itself is carried out.

Image: freepik

What is an impacted wisdom tooth?

Third molars, known as wisdom teeth, are the last teeth to erupt into the mouth. They appear last, usually between the ages of 18 and 25. In many people, however, these teeth never fully emerge. Instead of growing through normally, they remain trapped in the bone or beneath the gum line – a condition known as impaction.

Retention means that the tooth is ‘trapped’ in the jawbone or beneath the gum line. There are two main types. A tooth is considered fully impacted when it is not visible at all and can only be detected by an X-ray of the wisdom tooth. A partially impacted wisdom tooth is one in which part of the crown has broken through the gum, but the tooth has not reached its normal functional position.

Depending on the angle of inclination, impacted wisdom teeth are:

• mesially inclined (inclined towards the adjacent tooth)
• distally inclined (tilted towards the throat)
• horizontal (lying on their side) 
• vertical (upright, but still impacted)

The horizontal and mesial positions are the most common and usually cause the most dental problems, including pressure on neighbouring teeth and changes to the bite.

Causes of impacted wisdom teeth

Impacted wisdom teeth are caused by specific anatomical and growth factors, most of which are genetically determined. 

The most common causes of impacted wisdom teeth are:

• Insufficient space in the jaw – if the dental arch is too narrow for all 32 teeth, the wisdom teeth have no room to erupt.
• An oblique tooth position – delayed growth of a tooth in the wrong direction makes normal eruption of the wisdom tooth impossible.
• Dense bone tissue – in some people, the bone surrounding the wisdom tooth is denser, which makes eruption difficult.
• Presence of a physical barrier – an adjacent tooth, a cystic formation or excess bone tissue can block the path.
• Genetic predisposition – the shape of the jaw, the size of the teeth and the structure of the bone are hereditary characteristics.

Any of these causes may act independently or in combination with the others. Therefore, assessing a wisdom tooth using a panoramic X-ray or 3D computed tomography (CBCT) is essential for timely diagnosis and treatment planning.

Image: freepik

Symptoms of an impacted wisdom tooth

The symptoms of an impacted wisdom tooth vary considerably – from completely asymptomatic cases to severe pain and swelling. Here are the most common symptoms, categorised by group.

Pain and discomfort

Pain is one of the first signs that something is wrong with a wisdom tooth. Pain associated with an impacted wisdom tooth is usually felt at the back of the mouth, but may spread to the ear, neck or temple. It may be constant or occur when chewing or opening the mouth.

Inflammation and infection

An impacted wisdom tooth is a common entry point for dental infections. Inflammation of the gum tissue around a partially erupted tooth is known by the medical term pericoronitis. The tissue around the wisdom tooth becomes red, swelling occurs, and in more severe cases, pus may accumulate.

Untreated inflammation can develop into a serious infection with a high temperature and difficulty swallowing. Tooth decay in an adjacent tooth is a common consequence of an impacted wisdom tooth, as the area around it is difficult to clean and food debris and bacteria tend to accumulate there.

Other associated symptoms

As well as pain and infection, an impacted wisdom tooth can also cause a number of secondary symptoms. The pressure it exerts on neighbouring teeth sometimes leads to the displacement of the other teeth. Headaches, a feeling of tension in the jaw joint area and, in rare cases, even facial asymmetry have been reported following prolonged pressure from impacted teeth.

In rare cases, a dental cyst – a fluid-filled sac – may develop around an impacted wisdom tooth; if left untreated, this can destroy the bone and damage the roots of neighbouring teeth. None of these symptoms should be ignored, and a dental check-up should be booked promptly, before the problem worsens.

Image: freepik

What are the treatment options for an impacted wisdom tooth?

The choice of approach depends on the position of the tooth, the presence or absence of symptoms, the patient’s general state of health and the potential risks. Not every impacted wisdom tooth requires immediate intervention, but when symptoms are present, treatment should not be delayed.

In cases of pain, infection or misalignment of neighbouring teeth, the solution is to extract the wisdom tooth. The extraction of an impacted wisdom tooth is carried out under dental anaesthesia – a local anaesthetic – and in more complex cases, sedation may also be administered to ensure the patient’s complete comfort.

The surgical removal of a wisdom tooth takes place in several stages. After administering a local anaesthetic, the dental specialist makes a small incision in the gum; if necessary, they remove a small amount of bone tissue and extract the tooth, sometimes in sections if its position is complicated. 

Surgical extraction of a tooth in cases of severe impaction can take between 20 and 60 minutes, depending on the complexity. The wound is sutured, after which the patient receives detailed post-operative care from the clinic’s team.

Post-operative recommendations include taking painkillers and antibiotics as prescribed, avoiding hard and hot foods, refraining from smoking and drinking alcohol, and maintaining good hygiene around the affected area. The usual recovery period is between three and ten days. If the recommendations are followed, symptoms of swelling and pain will gradually subside.

If the impacted wisdom tooth is not causing any problems, an experienced dental specialist may recommend monitoring with periodic X-rays every 6 to 12 months.

Is it possible to experience complications?

Complications from an impacted wisdom tooth are a real possibility if treatment is delayed or missed. The most common dental complications include the development of a dental cyst, damage to the roots of neighbouring teeth, bone resorption and a periodontal pocket around the neighbouring tooth.

The surgical extraction itself carries minimal risk when performed by an experienced surgeon. However, patients should be aware that temporary numbness in the chin or lips may sometimes occur when a lower wisdom tooth is in close proximity to nerve structures. The risk of such a complication is assessed in advance by means of an X-ray of the wisdom tooth and precise planning of the operation.

Persistent toothache, chronic inflammation or recurrent infections around the wisdom tooth are clear indications for consultation with an oral surgeon. The sooner action is taken, the smoother the overall recovery following extraction will be.

Conclusion

Many patients put off their appointment due to fear or the belief that ‘it will sort itself out’. The reality is that an untreated problem rarely goes away without intervention; rather, it tends to worsen over time. 

Modern oral surgery employs techniques that make the procedure predictable and well-tolerated. It is important to be informed about every step – from the pre-operative examination to the final stage. If you suspect you have an impacted wisdom tooth, do not wait for the symptoms to worsen.

An impacted wisdom tooth is a problem that many people face in adulthood. Recognising the symptoms and visiting a dental clinic in good time are the best ways to protect yourself against discomfort caused by a wisdom tooth and serious complications. 

At DentaTime, we offer accurate diagnosis, minimally invasive surgical treatment and comprehensive post-operative care. Don’t delay – give us a call or book an appointment online.

Frequently Asked Questions

Can an impacted wisdom tooth be treated without surgery?

In rare cases of asymptomatic impaction, the dentist may recommend monitoring rather than surgery, but if symptoms develop, surgical removal is unavoidable.

How painful is the removal of an impacted wisdom tooth?

The procedure is carried out under dental anaesthesia and is painless. Discomfort may occur once the anaesthetic has worn off, but this can be easily managed with painkillers.

How can I tell if my wisdom tooth is impacted?

The only reliable way is an X-ray. A clinical examination without an X-ray cannot determine the exact position of the tooth.