Is it necessary to remove wisdom teeth? 

Wisdom teeth are a valuable asset to the mouth when they are healthy and properly positioned. Often, however, problems develop that require their removal. When the jaw isn't large enough to accommodate wisdom teeth, they can become impacted (unable to come in or misaligned) Wisdom teeth may grow sideways, emerge only part way through the gum or remain trapped beneath the gum and bone. 

Extraction of third molars is generally recommended: 

• When wisdom teeth only partially erupt; 
• When there is a chance that poorly aligned wisdom teeth will damage adjacent teeth; 

When a cyst (fluid-filled sac) forms, destroying surrounding structures such as bone tooth roots. 

The most common reason people choose to remove their wisdom teeth is that their mouth is t too small for these teeth to normally erupt behind the second molare into a good position. This can result in one of the following situations: 

1.  Complete Bony Impaction when the wisdom teeth are completely covered in bone.  When the tooth is completly covered with bone it will remain completly covered with its "developmental sack" in which all teeth develop. Later in life, this sack may undergo changes and enlarge and develop ionto a cyst. This cyst will enlarge at the expense of the bone of the jaw. These cysts should be removed and and examined by a pathologist. 

2.  Partial Bony Impaction whenThe teeth begin to erupt but are not able to erupt completely. In this situation, the upper third molars usually are poisitoned towards the cheek while the lower third molars usually lean forward with only part of the crown sticking through the gum. This situation can to decay and gum disease around the second molar directly in front of it. 

The most common complication of the partial bony impaction, is that the flap of gum tissue which partially covers the erupting third molar, creates a pocket where bacteria that are present in the mouth can grow and and cause an infection known as pericoronitis. The swelling and infection can become very serious. The treatment for pericoronitis is extraction of the third molar tooth. 

The risks and complications involved in the removal of third molars are:

PAIN
Surgical removal of the third molars can lead to some discomfort and pain. This is usually treated with pain medication. 

INFECTION
Because of the large number of bacteria present in the mouth post surgical infection is always possible. Patients are usually placed on prophylactic antibiotics to prevent infections from developing.

SWELLING
Following surgery patients may experience swelling and bruising. These symptome vary between patients. 

BLEEDING
Some post surgical bleeding is considered normal. This is usually minimal and is easily controlled with the pressure of biting on gauze. 

Most wisdom teeth can be removed with local anesthesia alone but many people prefer I.V. sedation during surgery. 
 

The upper third molars have roots which often are separated from the maxillary sinuses by only a very thin layer of bone.  Occasionally, a small communication is established between  the sinus and the oral cavity when one of the upper third molars is removed. If this is the  case, the normal procedure is for the area to be sutured closed, the patient to be informed  of the finding, appropriate antibiotics and decongestants to be prescribed, the patient to be  instructed to avoid Valsalva maneuvers (tasks which build up pressure in the sinus like nose  blowing and bearing down forcefully) and the patient reappointed for followup. Most often  this results in an uneventful healing period with no further treatment being required.  Occasionally, the area will heal open rather than closed in which case an additional small  surgical procedure will be required to close the communication. 
 

The lower third molars often have roots that lie very near or even wrapped around the  inferior alveolar nerve. This is the nerve that supplies feeling to the lip, teeth and tongue on  each side of the mouth. Occasionaly, when a lower third molar is removed, that nerve will  be bumped or bruised and if so a change in sensation may be noted on that side. It is  important to understand that this is a sensory nerve and does not affect the ability to move  the parts of the oral cavity to which it gives sensation (feeling). In most cases, the nerve  heals itself but, because nerves heal slowly, it may take six months to one year  before return of normal sensation. Very rarely, the damage to the nerve is permanent. 

Finally, the normal precautions, risks and benefits of extraction of any tooth (which are  beyond the scope of this discussion) also apply here and should be discussed with the  dentist prior to beginning any procedure.