Wisdom teeth are the last molars to come through, usually between the ages of 17 and 25. For some people, they erupt without issue. For many others, there is not enough room in the jaw for them to come through properly. When a wisdom tooth cannot fully emerge, it is described as impacted.
An impacted wisdom tooth is not always painful. Some sit quietly beneath the gum for years without causing problems. Others cause recurring pain, infection, or damage to adjacent teeth. Knowing the symptoms and understanding when intervention is needed can prevent a manageable situation from becoming an emergency.
What does "impacted" mean?
A wisdom tooth is impacted when it cannot erupt into its normal position because something is blocking it. That blockage is usually the adjacent second molar, the jawbone, or a combination of both.
Impaction is classified by the tooth's angle and depth:
- Mesioangular impaction. The tooth is angled forward, pushing toward the tooth in front. This is the most common type.
- Vertical impaction. The tooth is pointing in the right direction but cannot break through the gum or bone above it.
- Horizontal impaction. The tooth is lying on its side within the jaw.
- Distoangular impaction. The tooth is angled backward, away from the adjacent tooth.
The type and depth of impaction influence both the symptoms you experience and the complexity of removal if extraction is needed.
Symptoms of an impacted wisdom tooth
Not every impacted wisdom tooth produces symptoms. Many are discovered incidentally on routine dental X-rays. But when symptoms do appear, they tend to follow recognisable patterns.
Pain at the back of the jaw
A dull, aching pain near the angle of the jaw is the most common symptom. It may come and go, often worsening over days or weeks before settling. The pain can radiate to the ear, temple, or the side of the head.
If you experience persistent jaw pain, it is worth having it assessed. Our tooth pain page outlines common causes and when to seek help.
Swollen or tender gums
The gum tissue over a partially erupted wisdom tooth often becomes inflamed. You may notice redness, swelling, or tenderness at the very back of your mouth. The swollen gum can make it painful to bite down on that side.
Gum inflammation around a wisdom tooth
Pericoronitis
This is the clinical term for infection of the gum flap (operculum) that covers a partially erupted wisdom tooth. Food and bacteria get trapped under the flap, which can lead to localised infection.
Signs of pericoronitis include:
- Throbbing pain around the affected tooth.
- Swelling of the gum, cheek, or the side of the face.
- Difficulty opening the mouth fully (trismus).
- Bad taste or pus discharge from around the tooth.
- Swollen lymph nodes in the neck on the affected side.
Pericoronitis can range from mild discomfort to a serious infection requiring antibiotics and urgent care. If you suspect an infection, do not wait. Contact your dentist or visit an emergency dental appointment.
Damage to the adjacent tooth
An impacted wisdom tooth angled toward the second molar can press against it, causing resorption (breakdown of the root or enamel of the neighbouring tooth) or creating a pocket where decay develops between the two teeth. This damage often occurs without obvious pain until it is advanced.
This is one of the reasons dentists monitor wisdom teeth on X-rays even when they are asymptomatic.
Cysts or pathology
In rare cases, the sac of tissue surrounding an unerupted wisdom tooth can fill with fluid, forming a dentigerous cyst. These cysts can expand within the jawbone and damage surrounding teeth, nerves, or bone. They are typically painless in the early stages and are detected on X-rays.
When to act
The decision about whether to remove an impacted wisdom tooth depends on several factors. Not every impacted tooth needs to come out.
Situations where extraction is commonly recommended
- Recurrent pericoronitis. If the gum tissue around the tooth becomes infected repeatedly, removal addresses the source of the problem.
- Decay in the wisdom tooth or the adjacent tooth. If the impaction has created a cavity that cannot be effectively restored, extraction prevents further damage.
- Cyst formation. Any pathology associated with the tooth typically warrants removal.
- Orthodontic reasons. In some cases, an impacted wisdom tooth may interfere with aligner treatment or other orthodontic plans.
- Pain that does not resolve. Persistent or worsening pain from an impacted tooth that is not going to erupt into a functional position.
Situations where monitoring may be appropriate
- The tooth is fully buried in bone, asymptomatic, and not causing pathology on X-rays.
- The patient has medical conditions that make surgery higher risk.
- The tooth is close to the inferior alveolar nerve, and the risk of nerve damage during extraction is elevated.
Your dentist will assess your specific situation with clinical examination and imaging (typically an OPG or CBCT scan) before recommending a course of action. Read more about the general process on our wisdom teeth page.
What to expect if extraction is recommended
Wisdom tooth extraction is one of the most common surgical procedures in dentistry. What the procedure involves depends on the type of impaction.
Simple extraction is possible when the tooth has partially erupted and can be loosened and removed with standard instruments. Recovery is typically straightforward, with most patients returning to normal activity within a few days.
Surgical extraction is required when the tooth is fully buried in bone or positioned in a way that requires the gum to be opened and bone to be removed around the tooth. This is a more involved procedure with a longer recovery period, usually 5 to 10 days for the initial healing.
Both procedures are performed under local anaesthetic at the dental practice. For complex cases, your dentist may recommend referral to an oral surgeon.
For more on the recovery process, see our guide to wisdom teeth recovery.
Can you prevent impaction?
No. Wisdom tooth impaction is determined by jaw size, tooth size, and the angle at which the tooth develops. These are genetic and developmental factors that cannot be influenced by diet, oral hygiene, or any other intervention.
What you can control is monitoring. Regular dental check-ups with appropriate X-rays allow your dentist to track the position of your wisdom teeth and intervene early if problems are developing. For patients in their late teens and early twenties, this is particularly relevant.
What happens if you ignore an impacted wisdom tooth?
Ignoring an impacted wisdom tooth that is causing symptoms can lead to:
- Worsening infection that spreads beyond the mouth.
- Progressive damage to the adjacent tooth, potentially requiring its own treatment or extraction.
- Cyst development with bone loss.
- Increased complexity of extraction as the tooth moves or the roots continue to develop.
Early assessment and timely treatment tend to result in simpler procedures and faster recovery compared to waiting until a crisis develops.
Book a wisdom tooth assessment at Ivy Dental
If you are experiencing pain at the back of your jaw, swelling, or difficulty opening your mouth, have it assessed sooner rather than later. We see patients across north Brisbane at our Everton Park and Nundah practices, 7 days a week. Payment plans may be available to approved applicants for extraction costs.
Call us on (07) 3266 7120 to book an assessment.
