What are wisdom teeth?

Learn what it is all about below
Third Molar Teeth
(aka Wisdom Teeth)
Third molars are usually the last teeth to come through the gums in your late teens, early twenties. There is a lot of variation among individuals in relation to their third molars. Most people have 4 but others can have none. Some can come out without any issues; others may be problematic and stuck due to a lack of space. You should have regular visits with your oral health practitioner to help identify any potential issues and guide you through the treatment options. If there are foreseeable problems your oral health practitioner may recommend their removal before the problems, get worse. Removal of wisdom teeth is a common procedure. However, like all procedures there are risk associated with this treatment. With the complication rate varying between 2.6% - 30.9% depending on certain influences and the type of complication. The most common complication is pain and swelling associated with treatment. However, the main risk that is often discussed with regards to lower third molars with tooth roots that are close to the nerve (like this illustration), is the possibly of having temporary or permanent nerve paralysis (numbness/tingling). This paraesthesia is one of the least common complication outcome in most third molar extractions. Read more about this below.
Important Points In This Section
  • Location of the tooth to the Inferior Alveolar Nerve
  • Problems associated with impacted wisdom teeth
  • Complications associated with treatment
    Frequently asked questions:
  • Do I have to have my wisdom teeth removed?
  • Not always, it differs for every individual. Your local oral health practitioner will be able assess your situation and inform you of your options.

  • If my wisdom teeth are playing up and being painful does that mean I have to have them out?
  • No not exactly. Some wisdom teeth can cause problems as they are coming out, they may them calm down after they push fully through the gums. Furthermore, some impacted wisdom teeth may cause issues while others have been left and never caused an issue. The decision whether to have the wisdom tooth removed is always yours at the end of the day. The dentist is only there to offer you his/her professional opinion and what the evidence/studies have shown. Ultimately it is your tooth and your decision to make.

  • When is the best time to have wisdom teeth removed?
  • It is best to have troublesome wisdom teeth removed while your young. This is because the roots have not formed totally and the bone surrounding the tooth is often softer. This allows for easier removal of the tooth, and there is less risk of damaging the nerves, bone or other teeth.

  • What is the difference between local anaesthesia, conscious sedation and general anaesthesia?
  • Local anaesthesia is done in the dental surgery. It is the normal numbing procedure that the dentist gives by an injection. This anaesthesia is localised and only numbs the mouth and face. Conscious sedation is done in certain dental surgeries that are set up to accommodate for it. It involves using a sedative drug into a vein or via gas (Nitrous oxide/laughing gas) to help relieve anxiety. This still requires Local anaesthesia via an injection to help with the pain. General anaesthesia is done in hospital or very special dental surgeries whereby the patient is placed to sleep with an injection. General anaesthesia is given by a specialist anaesthetist. Due to the risks, this is usually reserved for people with difficult wisdom teeth to remove, patients that do not want to remain awake during surgery, patients who need multiple teeth to be removed and finally patients who have other problems with their wisdom teeth, gums or jaws.

  • What are the problems associated with impacted wisdom teeth? (see picture above)
  • Food trapping
    When the impacted tooth begins to push through the gum, it can create a pit that can hold food and is often difficult to clean
    Pericoronitis
    If the pit where the food trapping is not cleaned it can result in an infection around the tooth. Overtime, this can cause bad breath, unpleasant taste, pain, swelling and jaw stiffness. Which can make swallowing painful. It is very important you see your local oral health practitioner if this happens.
    Crowding
    This one is debated in the research and there is no consensus. The idea is that there is a chance that the impaction from the third molar may push nearby teeth out of their correct positioning.
    Caries/Decay
    The food trapping in the pit can result in tooth decay on not only the third molar but also sometimes on the neighbouring tooth. Early detection and prevention are recommended to avoid occurring difficult situations later.
    Pain
    This can be pain associated with the pressure from the third molar pushing on the tooth adjacent to it or can be associated with an infection around the third molar.
    Cyst
    Sometimes if an unerupted wisdom tooth is not removed, a sac of fluid called a cyst can form around the tooth. This cyst can destroy bone and damage other teeth and gums.
    Ulcer
    Sometimes upper third molars may push sideways out of the gum. This may rub against the inside of the cheek causing an ulcer.
    Resorption Cavity
    An impacted third molar may continue to push against the neighbouring molar. This may result in a resorption cavity forming on this neighbouring molar. This can lead to serious damage to both teeth which may become infected or develop an abscess (collection of pus (inflammatory cells)). Removal of both molars is often needed.

    Treatment:
  • Treatment of wisdom teeth can be performed in the dental chair with local anaesthetic (local numbing) or under general anaesthetics (GA) meaning (while your asleep). General anaesthesia is often not in the dental clinic instead it is performed in special suites set up to accommodate the anaesthesia equipment and require an anaesthetist (which is a specialised doctor for putting you to sleep). Certain types of removal can be done by a general dentist while others require an oral surgeon who is specialised in removing difficult teeth. If the area around the tooth has been infected, your surgeon/dentist may decide to delay surgery until the infection has been treated.
  • The surgeon will make a cut into your gums. A small portion of bone may need to be removed to allow the tooth to come out. The tooth may need to be divided into segments so it can be removed easily and safely. Stitches may have to be used to close the cut. The dentist/surgeon will inform you if the stitches will dissolve in a few days or if you will have to return for them to be removed.

  • After the surgery follow the post-operative instructions both written and verbally given by your dentist.(get davids post op instructions here)


  • Take it easy you just had a tooth out. Rest at home, do not do any exercise like running or lifting weights as this encourages bleeding.
  • Be careful not to bite you tongue or lip, have hot drinks or hard food while they are numb to avoid injuries. It can take a few hours before the numbing wears off.
  • In terms of eating, eat cold and soft type of foods today and tomorrow. This includes ice-cream, jelly, yogurt, mashed potatoes, or lukewarm non chunky soups. No spitting, rinsing, sucking through straws or smoking after an extraction. As you increase the risk of having a dry socket (alveolar osteitis). Do not consume wine, beer, or spirits while you are taking pain killers or antibiotics. This is a good time to give up smoking, as smoking impairs healing and increases the risk of postoperative infection.
  • Pain on the day of extraction is normal. In order to decrease this, it is it is advised that the patient take Panadol and/or Nurofen before the local anaesthetic wears off. Make sure you follow the instructions and dosages that the manufacture specifies. Use the section at the bottom of the post-operative instructions to record the time at which you had the medication to keep track of type, amount and when the medication was taken. This is provided to help reduce the chance of accidental overdose.
  • If there is excessive bleeding, apply pressure over the area by gently biting firmly on a piece of clean cotton cause. The cotton and pressure work like a band-aid, helping to stop bleeding by allowing formation of a blood clot. It is important that this area is not disrupted during this process as that can restart bleeding again. You may have slight oozing of blood for a day after surgery, bleeding should stop by the second day. If it does not stop after this or you have excessive bleeding even after biting firmly on a piece of clean cotton for more than 30 minutes, then contact your local dental clinic or go to the local hospital emergency department.
  • Avoid brushing and flossing near that socket immediately after extraction. Wait at least 24 hours before you can start rinsing with lukewarm salt water and gently brushing other teeth.
    Risks & Complications:

    Even with the highest standards of surgical practice, there are risks associated with all surgical procedures which makes wisdom tooth surgery no different. Although your dentist/surgeon will make every attempt to minimise risks, complications can still occur with some being permanent. It is important you understand and weigh up the risks with the benefits before treatment. The following possible complications are listed below to help you make an informed decision regards the potential risks that can occur. They are not to scare you, but to help you make a well-informed decision. It is not an extensive list with all the possible complications. It is important to inform your dentist of all your medical history, medications you are taking, your occupation and any concerns to help the dentist provide a personalised risk complication information that is specific to you.

  • After Extraction swelling (Oedema)
  • This is an expected and common complication after third molar surgery. It is a normal tissue response to the shock that the tissues underwent during the procedure. The onset of which is gradual with maximum swelling usually occurring after 48 hours (2 days) after surgery. Usually the swelling will die down by the 4th day and complete resolution by 7 days. Ice packs may help with comfortability for the patient. If this does not occur contact your local dentist or go to the emergency department of your local hospital.

  • After Extraction Pain
  • The post-surgical pain begins when the effects of the local anaesthesia wears off this is usually 6-12 hours after the surgery. To decrease this, it is it is advised that the patient take Panadol and/or Nurofen before the local anaesthetic wears off. Make sure you follow the instructions and dosages that the manufacture specifies. Use the section at the bottom of the post-operative instructions to record the time at which you had the medication to keep track of type, amount and when the medication was taken. This is provided to help reduce the chance of accidental overdose.

  • Nerve Disturbances type 1 (Numbness or altered sensation (uncommon))
  • Nerve damage to the lingual or inferior alveolar nerve (show photo) that run close to the lower wisdom teeth is one of the least desired complications of this procedure. This can happen even though the surgery was successful, and all care was taken to avoid injury to major nerves. The incidence of this injury ranges from 0.4% to 22% with most of these injuries having spontaneous recovery. It occurs due to the natural position of the lower molar lying close to the nerve. Which in these situations the nerve may become bruised on removal of the lower wisdom teeth. This can cause pain, numbness, tingling, and loss of feeling in teeth, gums, cheeks, lips, chin, tongue and around the jaw. If the lingual nerve is damaged, there is a risk of altered taste sensation. Speech may be affected in some cases. If a nerve is injured, it will usually heal with 96% of cases resolving after four to eight weeks. It is important during this time that you keep hot foods and drinks away from numb areas and be careful not to bite the lip or tongue. In some people, complete healing of the nerve may take a bit longer to heal (six to eighteen months). In rare cases, the nerve may not heal completely, and numbness or altered sensation may be permanent. If feeling is reduced in the tongue, lips or face, it may affect your speech, taste or even your ability to play woodwind or brass instruments. This can create major problems for some patients, especially if it affects their daily work. If this applies to you, tell your surgeon so these risks can be discussed.

  • Nerve Disturbances type 2 (Nerve damage causing pain (rare))
  • In rare cases, an injured nerve may heal poorly, and pain may persist or recur without diminishing. This can happen even though the surgery was successful, and all care was taken to avoid injury to major nerves. It is not fully understood why some nerves react in this way. The pain in these cases can sometimes be difficult to treat. Inform your local dentist of this pain for advice and management, which often involves specialist care.

  • Difficulty in opening the mouth (trismus)
  • Pain or discomfort when opening your mouth is common after removal of a third molar (wisdom tooth). This usually resolves by the end of the first week in line with when the swelling goes down.

  • Infection with Fever (uncommon)
  • Your body temperature may be slightly raised after surgery. It usually goes back to normal after 12 – 24 hours. A fever that lasts longer may be an indication of an infection or other problems. You should contact your local dentist or go to the emergency department of your local hospital. As you may be required to have antibiotics. Tell your dentist or surgeon if you have any allergies or allergic reaction to any antibiotic or other drug.

  • Excessive bleeding (haemorrhage) (rare)
  • Excessive bleeding can occur during or after the procedure. During the procedure, your oral health practitioner will be able help stop bleeding (achieving haemostasis) by following certain procedures and techniques. However, it is important you inform you oral health practitioner of any previous issues you have had with bleeding and/or any medications taken for your blood. This will help them be better prepared for this complication. Bleeding may be started by too much exertion or by vomiting after procedure. It can be stopped by placing gauze over the wound and applying pressure by biting gently on the gauze for 15-30 minutes like you did in the dental chair. If the severe bleeding does not stop, contact your local dentist, or go to the emergency department of your local hospital.

  • Damage to a nearby tooth or fillings (rare)
  • While the impacted tooth is being removed, the tooth or filling on the neighbouring tooth can be chipped or loosened.

  • Vomiting
  • If having general anaesthesia or conscious sedation, you may feel lightheaded and vomit while recovering from the effects of the anaesthetic.

  • Sinus problem (Oro-antral communication)
  • Your sinuses are air sacs that connect to your nose. The maxillary sinus sits just above your top teeth. In some cases, a sinus may be opened when a wisdom tooth is removed. The treatment required will depend on the size of the hole. If the opening is small, it can usually heal without further treatment. If it is larger it may require specialist management to close the hole. (Oro-antral Communication information here)

  • Weaken or fracture of lower and upper bone structures (rare)
  • Removal of an impacted wisdom tooth can cause the jawbone or maxillary tuberosity to become temporarily weaker or fracture. If there is fracture of the maxillary tuberosity there is risk of excessive bleeding (haemorrhage), tearing the maxillary sinus lining (an air sac near the nose), as well as changing the shape of the bone ridge which may affect replacement options later on in life. If this happens further surgery may need to be required by a specialist. On the other side, the lower jaw might break at the time of the surgery or during the weeks or months afterwards, while the jaw is still healing. Avoid contact sports for at least four weeks. It is important to note that these are rare events.

  • Dry Socket
  • After any extraction of a tooth, a blood clot will form over the bone. This clot is like a scab on an arm. It is important for proper healing and pain relief. If the blood clot is washed away or dissolves, the bone will be exposed to the mouth. This is call alveolar osteitis or a dry socket and usually occurs a few days after the extraction. This pain is not fun, often being described as worse than the pain from the initial toothache. It is a constant, throbbing pain that may last for many days. If you have pain like this contact your dentist/surgeon. However, the best management is prevention. Therefore, follow the (dry socket information here) to learn how to help avoid this situation.

Well Done!

If you have finished reading all the information on this page, get a certificate for your hard work.

Still have concerns?

This page provides general information about dental topics. It does not contain all the known facts of this subject and is not intended to replace personal advice from your dentist. If your not sure about anything on this site, contact us or speak to your local oral health practitioner. Make sure you give your local oral health practitioner your complete medical history and dental history.

Dentures

Learn more about false teeth (Dentures) as a replacement option.

read more
Implants

Learn more about Implants as a replacement option.

read more
Oro-antral Communication

Is a passage that can be created between the nose and mouth. Learn more about this.

read more

A selection of the references used:
Jerjes, W., Upile, T., Shah, P., Nhembe, F., Gudka, D., Kafas, P., … Hopper, C. (2010). Risk factors associated with injury to the inferior alveolar and lingual nerves following third molar surgery—revisited. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 109(3), 335–345. doi:10.1016/j.tripleo.2009.10.010
Mercier, P., & Precious, D. (1992). Risks and benefits of removal of impacted third molars. International Journal of Oral and Maxillofacial Surgery, 21(1), 17–27. doi:10.1016/s0901-5027(05)80447-3
Deliverska EG, Petkova M. Complications after extraction of impacted third molars- literature review. J of IMAB. 2016 Jul-Sep;22(3):1202-1211. DOI: http://dx.doi.org/10.5272/jimab.2016223.1202.
Bin im Garten, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Сергей Васильков, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons