Wisdom Teeth: When They Need Removing and When They Do Not
Wisdom teeth are the third molars, usually erupting between 17 and 25. For decades they were removed almost routinely. Current guidance is considerably more selective, and knowing the criteria saves people unnecessary surgery.
Why they cause trouble
The human jaw has become smaller over evolutionary time while the number of teeth has not changed. There is frequently insufficient room for the last molars to erupt properly.
A tooth that cannot fully emerge is impacted, and the direction matters:
- Vertical: upright but blocked
- Mesial: angled forward toward the tooth in front, the commonest
- Distal: angled backward
- Horizontal: lying sideways
Some people never develop wisdom teeth at all, which is a normal variant.
When removal is indicated
Current guidance generally supports removal for:
- Recurrent pericoronitis. Infection of the gum flap over a partially erupted tooth, causing pain, swelling, bad taste and difficulty opening the mouth. One episode may be managed conservatively; recurrent episodes usually mean removal
- Decay in the wisdom tooth that cannot be adequately restored, which is common because the position makes cleaning difficult
- Decay or root resorption in the adjacent second molar caused by the wisdom tooth pressing against it. This is a strong indication, because the second molar is a far more valuable tooth
- Gum disease around the wisdom tooth or the tooth in front
- Cysts or tumours associated with an unerupted tooth
- Abscess
- Interference with planned orthodontic or jaw surgery
- Fracture of the tooth
When removal is not indicated
Asymptomatic, disease-free wisdom teeth that are fully erupted and functional, or completely buried with no associated pathology, generally do not need removing.
Prophylactic removal of healthy asymptomatic wisdom teeth is no longer routinely recommended in several national guidelines, because the surgical risks are real and the proportion that would ever cause problems is lower than once assumed.
The crowding argument is weak. The belief that wisdom teeth push the front teeth crooked is not well supported. Lower front crowding occurs in people who never had wisdom teeth and in people whose wisdom teeth were removed years earlier. Late lower incisor crowding appears to be part of normal ageing of the dental arch.
Monitoring with periodic examination and occasional radiographs is a legitimate alternative to surgery for asymptomatic teeth.
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The age factor
Removal is generally easier in younger patients: roots are less fully formed, bone is more elastic, and healing is faster. Complication rates, particularly nerve injury and prolonged recovery, rise with age.
This creates a genuine tension. If a tooth is clearly going to cause problems, earlier removal is technically easier. If it may never cause problems, operating early means operating unnecessarily on a proportion of people. That trade-off is the reason guidelines emphasise individual assessment rather than a blanket rule.
Risks worth knowing before consenting
- Dry socket, where the blood clot is lost and bone is exposed. Severe throbbing pain typically starting day three to five, often radiating to the ear. More common in smokers, in lower teeth, and with rinsing or sucking through a straw early. Treated by the dentist with a dressing
- Infection
- Nerve injury. The inferior alveolar nerve runs close to lower wisdom tooth roots, and the lingual nerve lies nearby. Injury causes numbness or altered sensation of the lip, chin or tongue. Usually temporary; occasionally permanent. The risk is assessed on the radiograph beforehand, and a cone beam CT scan is sometimes used when the roots appear close to the nerve canal
- Jaw stiffness and limited mouth opening for days
- Bleeding
- Damage to the adjacent tooth or filling
- Sinus communication with upper wisdom teeth
- Jaw fracture, rare
Coronectomy, removing only the crown and deliberately leaving the roots, is an option when the roots are intimately related to the nerve, reducing nerve injury risk.
Recovery
- Swelling peaks around day two to three and then declines
- Pain is usually worst in the first 48 hours
- Most people return to normal activity within three to seven days for a straightforward extraction, longer for a complex surgical one
- Full bone healing takes months
What helps:
- Bite on gauze firmly for the first 30 to 60 minutes
- Ice packs on the outside of the face for the first 24 hours, then warm compresses afterwards
- Keep the head elevated, including propped up when sleeping the first night
- Soft, cool food for the first day or two
- Painkillers taken regularly for the first 48 hours rather than waiting for pain to build
- Start gentle warm salt water rinses from day two, not day one
- Keep brushing the rest of the mouth
What to avoid for the first 24 to 48 hours:
- Smoking, which markedly increases dry socket risk
- Straws and spitting forcefully, which dislodge the clot
- Vigorous rinsing on day one
- Hot food and drink
- Alcohol
- Strenuous exercise
- Poking the site with your tongue or fingers
Seek attention for
- Bleeding that does not stop after 30 minutes of firm pressure on gauze
- Severe pain starting or worsening around day three to five
- Swelling that is increasing after day three
- Fever
- Difficulty swallowing or breathing, which needs emergency care
- Inability to open the mouth more than a small gap after several days
- Numbness persisting beyond the expected anaesthetic duration
- A bad taste with pus
The short version
Wisdom teeth that are healthy, symptom-free and not damaging anything can usually be left and monitored. Repeated infections, decay, damage to the tooth in front, or cysts are the clear reasons to remove them. The crowding argument is not a good reason, and the main recovery rules are no smoking and no straws for the first couple of days.