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Wisdom Teeth

Commonly referred to as a wisdom tooth, the last molar has always been a source of much discomfort. Around the world and across all cultures there has always been some interesting reference to it. In English the connotation seems to be with its late appearance —much later than the other teeth and at an age where we would like to think of ourselves as a lot wiser.

In Turkey it is known as 'the 20th year tooth'; in Japan as 'unknown to the parents', from the idea that it erupts after a child has moved away; and as 'love teeth' in Korea, it refers to the pain of first love. Whichever way you refer to them, these teeth are known for their hidden troubles. Possibly because it is one of the last developments we have before reaching adulthood, maybe it is fitting that it is such a great pain.

Why are they such a problem?

Wisdom teeth often become a problem because there is not enough space to allow them to erupt normally. A space shortage will cause them to get trapped behind the existing teeth, becoming impacted. This could lead to the tooth either erupting partially or not at all.

Complete impactionA partially erupted tooth is very difficult to keep clean through normal brushing and flossing. Over time, the accumulation of bacteria, sugars and acids may cause a cavity to form leading to decay of the impacted tooth and possibly its healthy neighbour. The trapped bacteria and food debris can also cause bad breath (halitosis) or gum infection around the wisdom tooth (pericoronitis).

IIf the tooth is completely impacted, it can cause a deep bony ache as it pushes against the roots of its neighbour. This can also cause destruction of the neighbour’s roots in some cases. It is also believed that this vertical force can contribute to the crowding of the front teeth, causing them to overlap or appear twisted.

Should you have them removed?

When to consider extraction
  • Inability to keep clean
  • Recurrent gum infection
  • Damage to neighbouring tooth
  • Sever pain caused by pressure
  • Crowding of teeth

There are a few things to consider when deciding on whether to remove the wisdom teeth or not. It generally comes down to how effectively you are able to look after these teeth and how much discomfort they cause.

A partially exposed tooth can harbour a magnitude of bacteria that could cause problems at any stage. It is this unpredictability that has prompted surgeons to encourage patients to have them removed. Each case is unique.

If the tooth however causes symptoms, for instance a recurrent gum infection, you are sometimes better off having the tooth removed rather than run the risk of developing more severe symptoms in the future. Three episodes of infection is normally a high-risk case.

Decay of both wisdom tooth and neighbourAnother indication for removal is possible damage to the otherwise sound neighbouring tooth. This can happen either because of decay that has set in or the reabsorbing of the neighbouring tooth’s root by the wisdom tooth. If there is a high likelihood of damage to the neighbouring tooth, it is better to sacrifice a problematic tooth for the wellbeing of the whole mouth. Orthodontists may also request the wisdom teeth to be removed as they might interfere with their treatment.

What can you expect with extractions?

Although horror stories are plentiful the vast majority of wisdom teeth extractions are relatively simple and recovery is fast. This is however dependent on the size, shape and position of the tooth. With simple extractions, there is usually little swelling, bruising and/or bleeding and can normally be performed by your own dentist in the dental chair. More complex extraction where the tooth is severely trapped is generally carried out by specialist and may require special treatment. This can result in more bruising and swelling and is sometimes carried out in a surgical environment. Your dentist will be able to use x-rays to determine the complexity of your extraction and advise you on what to expect.

An unfortunate complication of any extraction is a condition called "dry socket”. If the blood clot that formed in the extraction area becomes dislodged, it exposes the underlying bone. This condition can be very painful, but resolves after a few days. By following some simple post treatment instructions that your dentist will provide you, you should be able to prevent that from happening.

In severe impactions, the roots of the lower wisdom tooth may lie near the main nerve to the lower jaw, or the crowns may be near the nerve to the tongue. In about 1 to 2% of the cases, these nerves could be damaged during removal of the tooth. The result would be numbness in the lips, chin, teeth or the tongue on the side affected. Movement would not be affected, only sensation. In most cases, sensation returns after a few months.

A Final Thought

Partially impacted, with no symptomsThe majority of problems occur when a tooth is partially erupted, thereby increasing the risk of developing gum infection and decay. By being extra vigilant in cleaning this area, these teeth can hide away for many years without giving any problems. Even if gum infection developed, early treatment with antiseptic mouth rinses and tissue salts can often clear the symptoms within a few days. With fully impacted teeth there is less risk of developing infection and they are generally therefore less of a problem. However, in both cases, if there is a risk of damage to the neighbouring tooth or surrounding structures, it is sometimes advisable to sacrifice a problematic tooth for the wellbeing of the whole mouth.

Like most aspects of dentistry, the goal of treatment is to maintain a comfortable and disease free environment. When considering the treatment for your wisdom teeth, it is important to ascertain how much its presence is impacting on your life and what risk there is of developing disease. Just because they are present it does not always mean that they have to be removed.