Although Permanent teeth last a lifetime, there are several reasons why tooth extraction may be needed. A very common reason involves a tooth that is too badly damaged from trauma or decay. 

Other reasons include:

Crowded mouth – Sometimes dentists do extraction to prepare space for realigning the teeth which may not be possible if your teeth are too big for your mouth. 

Infection – If tooth decay or damage extends to the pulp and the infection is so severe that antibiotics or RCT do not cure it, extraction may be needed to prevent the spread of infection. 

Impaction – If a tooth cannot erupt through the gum because there is no space in the mouth for it, your dentist may recommend pulling it.

Periodontal Disease: If periodontal disease have caused unrepairable loosening of the teeth, then extraction is required .