An impacted wisdom tooth is a back molar that does not have room to come through fully, so it stays partly or completely stuck under the gum or bone. Impacted wisdom teeth are common, especially in the lower jaw. Some cause pain, infection or damage to nearby teeth and are best removed, while others sit quietly and can be monitored. The modern approach is to treat the tooth based on whether it is causing problems, rather than removing every wisdom tooth automatically.
Key takeaways
- Impacted means the wisdom tooth cannot fully emerge because of a lack of space.
- Lower wisdom teeth are impacted more often than upper ones.
- Common signs include pain, swelling, bad taste and difficulty cleaning the area.
- Current evidence does not support removing symptom free, healthy impacted wisdom teeth automatically.
- Removal is advised when there is infection, decay, cysts, or damage to neighbouring teeth.
What impaction means
Wisdom teeth are the last molars to develop, usually in the late teens or early twenties. By then the jaw is often full, so there may not be enough room. A wisdom tooth can be angled forward, sideways, or held back by bone and gum, leaving it partly visible or fully buried. Partly erupted teeth are the ones most likely to cause trouble, because a flap of gum can trap food and bacteria. For the removal procedure itself, see our wisdom teeth removal guide.
Signs of a problem
Many impacted wisdom teeth cause no symptoms. When they do, common signs include an ache or pressure at the back of the jaw, red or swollen gum over the tooth, a bad taste or smell, pain on opening wide, and tenderness when cleaning the area. A specific infection called pericoronitis can develop around a partly erupted lower wisdom tooth, which we cover in pericoronitis and wisdom tooth infection. Recurring episodes are a common reason removal is recommended.
Do impacted wisdom teeth always need removing?
No, and this is where advice has changed. There is no reliable evidence to support removing symptom free, disease free impacted wisdom teeth just because they are impacted. Reviews of the evidence, including a Cochrane review, support a watchful monitoring approach for healthy, symptom free teeth, with regular check ups and imaging rather than automatic surgery. Removal is clearly worthwhile when there is a genuine problem. A dentist weighs the position, your ability to clean the tooth, and any signs of disease before recommending anything.
Remove or monitor?
| Situation | Usual approach |
|---|---|
| Repeated infection or pericoronitis | Removal often advised |
| Decay in the wisdom tooth or the tooth in front | Removal often advised |
| Cyst or damage to the neighbouring tooth | Removal advised |
| Symptom free, healthy, cleanable | Monitor with check ups and X-rays |
| Fully buried, no problems | Often left and watched |
What removal and recovery involve
If a wisdom tooth does need to come out, it can usually be done with local anaesthetic, sometimes with sedation for more difficult cases. A buried tooth may need a small surgical procedure. Recovery generally takes a few days to a couple of weeks, and our wisdom teeth recovery timeline explains what to expect day by day. Keeping the area clean and following aftercare instructions lowers the risk of complications like a dry socket.
Frequently asked questions
How do I know if my wisdom tooth is impacted?
Only an examination and X-ray can confirm it. Symptoms like back of jaw pain, swelling or a bad taste can be a clue, but many impacted teeth cause none.
Should I remove wisdom teeth that do not hurt?
Not automatically. Current evidence supports monitoring healthy, symptom free impacted teeth rather than removing them just in case.
Are lower or upper wisdom teeth impacted more often?
Lower wisdom teeth are impacted more commonly than upper ones, and partly erupted lower teeth are the most prone to infection.
What is pericoronitis?
It is an infection of the gum flap over a partly erupted wisdom tooth. It causes pain, swelling and a bad taste, and can recur, which often prompts removal.
Is wisdom tooth removal painful?
The procedure is done under anaesthetic, so it is not painful at the time. Some soreness and swelling afterwards is normal and settles over a few days.
The bottom line
Impacted wisdom teeth are common, and whether one needs removing depends on the trouble it is causing, not simply the fact that it is stuck. Painful, infected or damaging teeth are best dealt with, while quiet, healthy ones can often be watched. If your wisdom teeth are bothering you or you want them assessed, the team at Lumi Dental can help, and you can see current options on our current deals page or book with a dentist in Melrose Park.
This article is general information and is not a substitute for personal dental advice. For advice about your own teeth, please see a dentist.
