Patients often ask questions: Is it necessary to treat decayed tooth, or how long it will serve after treatment? According to the Endodontists in Alabama, 97% of the teeth keep their functions even when 10 years passed after endodontic treatment. With a correctly root canal treatment and subsequent reduction of the tooth, it will serve for several decades. If for some reason previous root canal treatment was unsuccessful, the prognosis of survival for such teeth reduces to 68-87%. Therefore it is very important to carry out high-quality root canal treatment.