Wisdom teeth: when they have to come out, and when they don't
Not every wisdom tooth needs removing. What the X-ray is actually looking for, what the procedure involves, and an honest recovery timeline.
Wisdom teeth arrive between roughly 17 and 25, into a jaw that has usually finished growing and often doesn't have room for them. Some emerge perfectly and cause no trouble for life. Others get stuck part-way, or lie sideways against the tooth in front, and become a slow-burning problem.
The useful thing to know is that the two outcomes look nearly identical from the outside. The difference is on the X-ray.
When removal is genuinely needed
- Repeated pericoronitis. The gum flap over a partly erupted tooth traps food and bacteria, and the area becomes swollen and painful. One episode can be treated. Repeated episodes usually mean the tooth is the problem.
- Decay you cannot reach. Wisdom teeth sit at the very back and are hard to clean well. Decay there is difficult to restore, and a filling in a tooth you can't clean tends to be a temporary answer.
- Damage to the tooth in front. An angled wisdom tooth pressing against the second molar can cause decay or bone loss on the back of a tooth that was perfectly healthy. This is the most under-appreciated reason, because the wisdom tooth itself may not hurt at all.
- Cysts or bone changes around an unerupted tooth, seen on the X-ray.
- A tooth with no opposing partner that has over-erupted and is now biting into the gum on the other side.
When it can stay
Plenty of wisdom teeth are fine and should be left alone. A tooth that has fully erupted, sits upright, meets its opposite number when you bite, and can be brushed properly is a functioning tooth. There is no benefit to removing it prophylactically.
A fully buried tooth with no symptoms, no decay, no pressure on the tooth in front, and nothing worrying on the X-ray can often be monitored rather than removed. Reviewing it periodically is a reasonable plan.
What the assessment involves
An OPG X-ray showing all four wisdom teeth, their angle, their root shape, and their relationship to the nerve canal in the lower jaw. That last point matters: the nerve supplying sensation to the lower lip and chin runs close to the roots of lower wisdom teeth, and knowing exactly how close changes how the extraction is planned. Occasionally a CBCT scan is needed when the relationship looks tight.
This is why a wisdom tooth decision made without an X-ray isn't really a decision.
What the procedure is actually like
A straightforward, fully erupted wisdom tooth is removed much like any other tooth: local anaesthetic, a few minutes of firm pressure, done. Most people are surprised by how quick it is.
An impacted tooth is a surgical extraction. The gum is lifted, a small amount of bone may be removed, the tooth is often sectioned into pieces so it can come out through a smaller opening, and the gum is stitched. It takes longer, usually 20 to 40 minutes, and it's done under local anaesthetic. You feel pressure and movement but not pain.
An honest recovery timeline
- Day 0. Numbness for a few hours. Bite on the gauze. Do not rinse, spit, or use a straw, all three can dislodge the clot. Cold compress on the cheek, 20 minutes on and 20 off.
- Days 1 to 2. Peak swelling, usually on day 2 rather than day 1. Stiff jaw. Soft, cool food. Start gentle warm salt water rinses from day 1, but let the water fall out rather than spitting forcefully.
- Days 3 to 4. Swelling starts to reduce. Bruising on the cheek or jaw may appear now and is normal. Most people are comfortable enough to work.
- Days 5 to 7. Back to normal for most simple cases. Stitches, if not dissolving, come out around now.
- Weeks 2 to 4. Full healing of the socket. Jaw opening returns fully.
The complication worth knowing about is dry socket: severe pain starting around day 3 to 5, often with a bad taste, caused by the blood clot being lost. It's uncommon, more likely in smokers, and very treatable, but it needs a visit rather than more painkillers. Pain that is getting worse after day 3 rather than better is the signal.
Practical things that genuinely help
- Don't smoke for at least 72 hours. Smoking is the single biggest risk factor for dry socket.
- Take the pain relief before the anaesthetic wears off, not after the pain starts. Staying ahead of it works far better than catching up.
- Sleep propped up on an extra pillow for the first two nights. It measurably reduces morning swelling.
- Book a Thursday or Friday if you can. Two quiet weekend days covers the worst of it.
- Eat properly. Soft does not mean nothing. Poor nutrition slows healing more than people expect.
If you're in braces
Wisdom teeth and orthodontics interact more often than patients expect. Sometimes removal is planned as part of treatment to make space or to allow molars to be moved back. Sometimes it's deliberately deferred until braces come off. Either way it should be a planned decision made with your orthodontist rather than something arranged separately, because the timing affects the treatment plan.
Common questions
Do all four wisdom teeth have to come out at once?+
No. It is a choice. Doing all four in one appointment means one recovery period, which many people prefer, but the first few days are harder. Doing one side at a time keeps you able to chew on the other side throughout. Both approaches are reasonable and the decision is usually yours.
Does wisdom tooth removal hurt?+
The procedure itself does not, because the area is fully numb. You feel pressure and movement. The discomfort comes afterwards, peaking around day 2, and is manageable with ordinary pain relief for most people.
How long do I need off work?+
For a simple extraction, often none beyond the day itself. For a surgical extraction of an impacted tooth, most people take one to two days and are comfortable by day four or five. Physically demanding work is worth avoiding for the first two or three days.
Will removing wisdom teeth change my face shape?+
No. Swelling for a few days will change how your face looks temporarily, but the underlying bone and facial structure are unaffected. This is a persistent myth with no basis.
Is it done at the clinic or do I need a hospital?+
The great majority of wisdom tooth extractions, including impacted ones, are done at the clinic under local anaesthetic by the oral surgery consultant. Only unusually complex cases or those needing general anaesthetic are referred on, and you would be told that at the assessment rather than on the day.