Until a few years ago, a root canal treatment would require 3-4 visits to the dentist. But with the development of nickel-titanium root canal instruments and the introduction of modern methods of filling and sealing the root canal systems, the dentist is able to complete most root canal treatments in a single visit.The motor driven instruments used nowadays help in cleaning and shaping the root canals faster than the conventional hand instruments. However, patients with severe infection or curved or calcified canals might require 2-3 visits to the dentist.