By the Lakehurst Dental Team · Medically reviewed by Brian S. Klohn, DMD, University of Pennsylvania School of Dental Medicine, 1991 · Lakehurst Dental, 19 Union Avenue, Lakehurst, NJ
Quick Answer
A wisdom tooth needs to come out when it is impacted, when it is decayed or repeatedly infected, when it is damaging the tooth in front of it, or when it cannot be kept clean. A wisdom tooth that is fully erupted, in a normal position, biting properly against its opposite tooth and cleanable can usually be left alone and monitored with periodic exams and X-rays. The decision is made from an examination and a radiograph — not from age alone.
What This Article Covers
- What Wisdom Teeth Are, and Why They Cause Trouble
- Impacted, Partially Erupted, Fully Erupted — the Words That Matter
- The Reasons a Wisdom Tooth Should Come Out
- The Reasons to Leave a Wisdom Tooth Alone
- Why Age Changes the Calculation
- What the Procedure Actually Involves
- Recovery, Day by Day
- Dry Socket, and How to Avoid It
- When to Call the Office Rather Than Wait
- Frequently Asked Questions
What Wisdom Teeth Are, and Why They Cause Trouble
Wisdom teeth are the third molars — the last four teeth at the very back of the mouth, one in each corner. They are the final adult teeth to develop, and they typically begin to erupt in the late teens or early twenties.
The difficulty is arithmetic. By the time third molars arrive, twenty-eight adult teeth are already in place and the jaw has finished growing. If there is not enough room behind the second molar, the wisdom tooth has nowhere useful to go. It may come in tilted, it may come in only partly, or it may never break through the gum at all.
Some people never develop wisdom teeth. Some develop one, two or three rather than four. Some have four that erupt straight and cause no trouble for a lifetime. All of these are normal.
Impacted, Partially Erupted, Fully Erupted — the Words That Matter
Most of the decision comes down to which of these describes your tooth.
- Fully erupted and upright. The tooth has come through, sits in a normal position, and meets an opposing tooth when you bite. If you can reach it with a brush and floss, this tooth is often left in place.
- Partially erupted. Part of the crown is through the gum and part is still covered by a flap of tissue. This is the position that causes the most problems, because the flap traps food and bacteria in a space no toothbrush reaches.
- Fully impacted. The tooth is entirely under the gum, and often under bone. It may be sitting upright, tilted forward into the tooth in front, tilted backward, or lying on its side.
Only an X-ray shows the position of an impacted tooth, the shape of its roots, and its relationship to the nerve that runs through the lower jaw. That radiograph is why a wisdom tooth consultation always includes imaging.
The Reasons a Wisdom Tooth Should Come Out
There are a handful of clear clinical reasons, and they are worth knowing so you can recognise them.
- Pericoronitis — infection under the gum flap. A partly erupted tooth collects debris beneath the overlying tissue. The gum becomes swollen, tender and sometimes produces a bad taste. It often flares, settles with cleaning or antibiotics, then flares again. Repeated episodes are one of the most common reasons for removal.
- Decay that cannot be restored. Wisdom teeth are the hardest teeth in the mouth to clean and among the hardest to fill well, because access is poor. A cavity on a third molar is frequently better resolved by removing the tooth than by restoring it.
- Damage to the second molar. A wisdom tooth angled forward presses against the tooth in front. That contact point is impossible to clean and can produce decay or bone loss on the second molar — a far more valuable tooth. This is one of the strongest arguments for early removal, because the damage is to a neighbour worth protecting.
- Gum disease around the tooth. Deep pockets that will not respond to cleaning behind the last molar.
- Cysts or other pathology. The sac that surrounded the developing tooth can occasionally enlarge into a cyst. This is uncommon, but it is one of the things a dentist is looking for on the X-ray.
- The tooth cannot be kept clean. If you cannot physically reach it, it will eventually become a problem, and the question is when rather than whether.
The Reasons to Leave a Wisdom Tooth Alone
Removal is surgery, and surgery is not free of risk. A wisdom tooth that is erupted, upright, functional, cleanable and free of decay or gum problems does not need to be removed simply because it is a wisdom tooth.
What that tooth does need is monitoring — an examination and periodic X-rays so that if the situation changes, it is caught early rather than at three in the morning.
There is also a genuine and ongoing professional debate about removing symptom-free impacted wisdom teeth in people who have no signs of disease. Reasonable dentists and oral surgeons take different positions on it. What is not debated is that a tooth causing infection, decay or damage to its neighbour should come out. If you are being advised to remove a tooth that has never bothered you, it is entirely fair to ask what specifically was seen on the X-ray that prompts the recommendation.
Why Age Changes the Calculation
Wisdom tooth roots are not fully formed in the late teens. They finish developing over the following years, and the surrounding bone becomes denser with age.
The practical consequences: removal tends to be more straightforward when the roots are shorter and the bone is more elastic, and healing tends to be faster in a younger patient. Later removal is entirely possible and done routinely — it simply tends to involve a more involved procedure and a longer recovery.
This is the reason wisdom teeth are so often assessed in the teenage years. The point of that assessment is not to remove teeth automatically. It is to look at the X-ray while the decision is still an easy one to make in either direction.
What the Procedure Actually Involves
A wisdom tooth removal falls somewhere on a spectrum, and where it falls is known before you sit down, because it is visible on the radiograph.
A simple extraction applies to a fully erupted tooth. The area is numbed, the tooth is loosened and lifted out. It is not very different from having any other tooth removed, and it is often quick.
A surgical extraction applies to an impacted tooth. After numbing, a small incision is made in the gum, a little bone may be removed, and the tooth is often sectioned — divided into pieces — so that it can be lifted out through a smaller opening than the whole tooth would need. Sectioning sounds alarming and is actually the gentler approach: it removes less bone. Stitches are usually placed afterward, and many are the dissolving kind.
Anaesthetic options range from local anaesthetic alone, which is what most straightforward removals use, through sedation for anxious patients or more involved cases. Some cases are best handled by an oral surgeon, and part of the consultation is deciding honestly which category yours falls into. Our extraction services page covers what we handle in the office.
Recovery, Day by Day
Recovery is more predictable than most people expect, and knowing the shape of it removes most of the anxiety.
- The first day. Bite firmly on the gauze for as long as you are told to. Some oozing is normal. Ice on the outside of the face in intervals helps with swelling. Rest, and do not exercise.
- Days two and three. This is usually the peak of swelling and stiffness, including difficulty opening wide. It is normal, and it is the turning point rather than a sign something is wrong.
- Days four to seven. Steady improvement. Most people are eating fairly normally by the end of the week.
- Two weeks onward. The gum has closed over. The bone underneath continues to fill in over the following months, quietly and without you noticing.
The rules that matter most in the first few days: do not use a straw, do not smoke or vape, and do not rinse forcefully. All three create suction or pressure that can dislodge the clot forming in the socket. Eat soft food, keep up gentle salt-water rinses after the first day if you are told to, and take pain relief as directed rather than waiting for discomfort to build.
Dry Socket, and How to Avoid It
Dry socket is the complication people have heard of, and it is worth understanding rather than fearing.
A blood clot forms in the socket after the tooth comes out. That clot is the scaffold healing is built on, and it protects the exposed bone underneath. If it is dislodged or breaks down early, the bone is left uncovered.
The signature is timing: pain that was improving and then, typically around day three to five, becomes significantly worse rather than better, often radiating toward the ear, and often with a bad taste or odour. Ordinary post-operative discomfort improves each day. Pain that reverses direction is the signal to call.
It is treatable — the socket is cleaned and a medicated dressing is placed, and relief is usually rapid. Prevention comes down to the same short list: no suction, no smoking, no vigorous rinsing, and follow the instructions you were given.
When to Call the Office Rather Than Wait
Call promptly if you have any of the following, whether or not you have recently had a tooth out:
- Swelling of the face or jaw that is increasing rather than decreasing
- Difficulty swallowing, or difficulty opening the mouth that is getting worse
- Fever alongside dental pain
- Pain that improves and then sharply worsens after several days
- Bleeding that does not slow with firm gauze pressure
- A bad taste or discharge from the area
Difficulty swallowing or breathing, or swelling spreading toward the eye or down the neck, is an emergency. That warrants immediate care, not a next-day appointment.
Frequently Asked Questions
No. A wisdom tooth that is fully erupted, upright, biting normally against an opposing tooth, free of decay and gum problems, and reachable with a toothbrush and floss can often be kept and monitored. Removal is recommended when a tooth is impacted, repeatedly infected, decayed beyond reasonable repair, damaging the tooth in front of it, or impossible to keep clean. The decision comes from an examination and an X-ray rather than from age.
There is no single correct age, but removal in the late teens or early twenties tends to be more straightforward, because the roots are not yet fully formed and the surrounding bone is less dense. Healing also tends to be quicker at that age. Wisdom teeth are removed successfully at every age when there is a clinical reason, so being older is not a barrier — it generally means a somewhat more involved procedure and a longer recovery.
Most people find swelling and stiffness peak on the second or third day and then improve steadily, with a return to normal eating by roughly the end of the first week. Two or three days of taking it easy is a reasonable plan for a straightforward removal, and a little longer for an impacted tooth. The gum closes over within about two weeks, while the bone underneath continues to fill in over the following months.
Dry socket occurs when the blood clot in the healing socket is lost or breaks down early, leaving bone exposed. The telltale sign is pain that was improving and then becomes markedly worse around the third to fifth day, often spreading toward the ear. Avoid it by not using straws, not smoking or vaping, and not rinsing forcefully in the first several days, since all of these create suction or pressure on the clot. It is readily treated in the office with cleaning and a medicated dressing.
The removal itself should not hurt. The area is thoroughly numbed first, and you should feel pressure and movement rather than pain. If you feel anything sharp during the procedure, say so — more anaesthetic can be given. Discomfort afterward is normal as the anaesthetic wears off and is usually well controlled with the pain relief recommended to you, taken on schedule rather than waiting for it to build.
Sometimes, but it needs to be a monitored decision rather than an ignored one. Impacted wisdom teeth can cause decay or bone loss on the second molar in front of them, and that damage is often painless until it is significant. If an impacted tooth is being left in place, it should be reviewed at regular examinations with periodic X-rays so that any change is caught early. Ask specifically what the X-ray shows and what is being watched.
It depends on the tooth. Straightforward erupted wisdom teeth are commonly removed in a general dental office. Deeply impacted teeth, teeth with roots lying close to the nerve in the lower jaw, and cases where a patient wants deeper sedation are often better referred to an oral surgeon. Part of the consultation is looking at the radiograph and making that call honestly. We are glad to tell you which category your teeth fall into.
Speak With a Dentist in Lakehurst
If your wisdom teeth are sore, or you have been told they should come out and you would like a second opinion, we are glad to look. Lakehurst Dental has cared for families in Lakehurst, Toms River and across Ocean and Monmouth counties for more than 34 years. To ask a question or arrange a consultation, call (732) 943-4090 or contact our office.
This article is general information and is not a substitute for an examination and personal advice from your dentist.