Signs you may need your wisdom teeth removed

Wisdom teeth usually arrive between 17 and 25. Some people never get them; some have all four with no trouble at all.

Before the list of warning signs, the more important point: not every wisdom tooth needs removing.

When they should be left alone

A wisdom tooth that has come through fully, sits in a functional position, is free of decay and gum problems, and is causing no symptoms does not automatically need to come out. Routine removal of healthy, symptom-free wisdom teeth is not supported by good evidence, and extraction carries real risks that doing nothing does not.

If removal is recommended, it is entirely reasonable to ask: what specifically is wrong with this tooth, what happens if we leave it, and what are the risks either way. Those are fair questions and you should get clear answers.

What a healthy wisdom tooth does need is monitoring — they are hard to clean and can develop problems later.

Signs that do warrant assessment

Recurrent pain or swelling at the back of the jaw. Particularly episodes that come and go. This is often pericoronitis — infection of the gum flap over a partially erupted tooth — which tends to recur once it has started.

A gum flap that traps food over a partly erupted tooth. Almost impossible to keep clean, and the usual source of repeated infection.

Decay in the wisdom tooth or the tooth in front of it. This one matters more than people realise. A wisdom tooth pressing against the second molar can cause decay on the back surface of that molar — a healthy, useful tooth — in a spot that is very difficult to restore. Losing a second molar to a wisdom tooth is a genuinely bad outcome and a strong reason to act early.

Persistent bad taste or bad breath from the back of the mouth.

Difficulty opening the jaw, or pain on chewing.

An impacted tooth on an X-ray, particularly one angled into its neighbour.

A cyst or other change around the crown of an unerupted tooth. Uncommon, but a clear indication for removal.

A wisdom tooth with no opposing tooth, over-erupting and biting into the opposite gum.

An upper wisdom tooth traumatising the cheek.

The kinds of impaction, and why the angle matters

"Impacted" simply means the tooth cannot reach a normal position. How it is stuck determines both the likelihood of problems and the difficulty of removing it.

This is also where the honest conversation about timing sits: a mesially impacted lower wisdom tooth against a healthy second molar is a different proposition from a fully bony one that has never caused a symptom.

Pericoronitis, which is what most people actually have

The most common wisdom tooth problem, and worth recognising because it is manageable in the short term.

What it is: the gum flap over a partly erupted tooth traps food and bacteria underneath, and the area becomes infected. Typically a sore, swollen area behind the last molar, a bad taste, pain on biting — often because the upper tooth is biting onto the swollen flap — and sometimes difficulty opening.

What helps in the short term: warm salt-water rinses, careful cleaning of the area with a small brush, soft food, pain relief as directed on the packet. If there is facial swelling, fever or difficulty swallowing, that is urgent and may need hospital care.

Why it recurs: the flap is still there. Episodes tend to return, often at inconvenient times, which is why repeated pericoronitis is one of the clearest indications for removal.

Age, and why earlier is usually easier

A real consideration rather than a sales argument.

In the late teens and early twenties the roots are often not fully formed, the bone is more elastic, and healing is quicker. In the forties and beyond, roots are complete, bone is denser, healing is slower, and complication rates rise.

That does not mean healthy wisdom teeth should be removed young "just in case". It means that where a tooth has a clear problem, or a clear trajectory towards one, deferring it for a decade usually makes the eventual procedure harder rather than avoiding it.

What crowding is not

Wisdom teeth are still widely blamed for crowding of the front teeth. The evidence does not support this, and removing wisdom teeth to prevent crowding, or to stop teeth relapsing after braces, is not a sound reason on its own. Front teeth drift with age regardless. Retainers are what prevent orthodontic relapse.

How it is assessed

A clinical examination plus an OPG — a panoramic X-ray, which we take on site. That shows the position and angle of each wisdom tooth, its roots, the state of the neighbouring molars, and — critically for lower teeth — how close the roots sit to the inferior alveolar nerve, which supplies sensation to the lip and chin.

That relationship largely determines both the difficulty and the risk, and it is why nobody should be recommending removal without imaging.

Where the OPG suggests the roots are intimately related to the nerve canal, a cone-beam CT gives a three-dimensional view and changes the planning. That is a referral, and it is the right call in those cases.

What the procedure involves

1. Consultation and imaging, and a written quote before anything is booked
2. Local anaesthetic, sometimes with sedation or — for complex cases — a general anaesthetic in hospital
3. Access: a small incision in the gum where the tooth is covered
4. Bone removal, where the tooth is enclosed
5. Sectioning the tooth, often, so each root comes out along its own path. This is routine and gentler on the bone than forcing a tooth out whole
6. Cleaning the socket, and stitches where needed — usually dissolving, gone within one to two weeks
7. Gauze, instructions, and a review

A straightforward upper wisdom tooth can take a few minutes. A horizontally impacted lower one takes considerably longer.

Risks worth knowing

Removal is common and usually straightforward, but it is surgery:

• Pain, swelling and jaw stiffness for several days — expected rather than a complication
• Dry socket, where the clot is lost. Genuinely painful; much more likely if you smoke
• Infection
• Nerve injury, mainly with lower wisdom teeth close to the nerve — causing numbness or altered sensation in the lip, chin or tongue. Usually temporary; occasionally permanent
• Sinus communication with upper wisdom teeth
• Damage to the adjacent tooth or an existing filling

The risk of nerve injury is the main reason cases close to the nerve are referred to a registered oral and maxillofacial surgeon rather than done in general practice. If that is what your case needs, we will say so.

A coronectomy — removing the crown and deliberately leaving the roots where they sit against the nerve — is an established option in selected high-risk cases. It is a specialist decision, and worth knowing exists.

Tell us beforehand about

• Blood thinners or anticoagulants. Do not stop them yourself
• Bisphosphonates or denosumab, current or past
• Diabetes, immune conditions or immunosuppressant medication
• Heart valve replacements or previous endocarditis
• Radiotherapy to the head or neck, at any time
• Pregnancy, or any chance of it
• Previous difficulty with dental anaesthetic, or prolonged bleeding

Recovery

Expect a few days of swelling and discomfort, peaking around day two or three. Ice for the first day, soft food, and no smoking — it substantially raises the risk of dry socket.

Do not rinse, spit or use a straw for 24 hours. After that, gentle warm salt-water rinses.

Practical notes: plan two or three quiet days, arrange a lift home if you have had sedation, stock soft food beforehand, sleep propped up on the first night, and do not plan strenuous exercise for a few days.

Contact us if pain worsens sharply after day three, swelling increases rather than decreases after day three, bleeding will not settle, or you develop a fever.

Go to a hospital emergency department for spreading facial swelling or difficulty breathing or swallowing.

Questions we are asked

Do all four have to come out at once? No. Sometimes it is sensible — one recovery, one anaesthetic — and sometimes one side at a time is better so you can still chew.

Will I need a general anaesthetic? Most removals are done under local anaesthetic. A general is for complex cases or where it is clinically appropriate, and it is done in hospital with an anaesthetist.

How long will I be off work? Usually a day or two for straightforward cases, two to three days for surgical ones. Longer if you do heavy physical work.

Does health insurance cover it? Usually partly, under major dental, depending on the item numbers and your waiting periods. Hospital cases involve separate hospital and anaesthetist fees. Ask for a quote with item numbers first.

Do I need the gap replaced? No. Wisdom teeth are not replaced.

I have no wisdom teeth at all. Fairly common, and not a problem.

Can I just keep treating the infections? For a while. Each episode is treated, and each one tends to come back, which is the argument for dealing with the cause.

Where we fit in

We assess wisdom teeth, take the OPG, and remove straightforward cases. Impacted, deeply positioned or high-risk cases are referred to a specialist. Victorian Dental Group is a general dental practice and holds no specialist registration; referrals go to a registered oral and maxillofacial surgeon.

Read more about wisdom teeth, dental surgery or the wisdom tooth dilemma.

Victorian Dental Group — 291 Wattletree Road, Malvern East VIC 3145 · (03) 9088 5808 · book online

General information only, not personal dental advice. See our disclaimer.