Although permanent teeth were meant to last a lifetime, there are a number of reasons why tooth extractions may be needed. The most common is a tooth that is too badly damaged, from trauma or decay, to be repaired. Other reasons include:
A crowded mouth. Sometimes dentists pull teeth to prepare the mouth for orthodontia. The goal of orthodontia is to properly align the teeth, which may not be possible if your teeth are too big for your mouth. Likewise, if a tooth cannot break through the gum (erupt) because there is not room in the mouth for it, your dentist may recommend pulling it.
Infection. If tooth decay or damage extends to the pulp -- the center of the tooth containing nerves and blood vessels -- bacteria in the mouth can enter the pulp, leading to infection. If infection is so severe that antibiotics do not cure it,
extraction may be needed to prevent the spread of infection.
Risk of infection. If your immune system is compromised (for
example, if you are receiving chemotherapy or are having an
organ transplant) even the risk of infection in a particular tooth
may be a reason to pull the tooth.
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