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Endodontically-treated teeth often have undergone significant coronal destruction and possibly loss of radicular dentin, secondary to endodontic treatment. For many decades, metallic posts have been a standard part of a dentist’s armamentarium for restoring endodontically-treated teeth. As in most technologies, there has been a continuous search for the optimal material, design, and physical properties of the endodontic post. Currently available fiber-reinforced resin posts and fiber-reinforced resins are essentially composite materials; they are composed of fibers of carbon or silica surrounded by a matrix of polymer resin. The similarity between their modulus of elasticity and that of dentin possibly seems to lower the risk of failure due to root fracture. These lectures will analyze available data and provide a practical albeit evidence-based approach to the advantages and limitations of fiber-reinforced resin technology in clinical practice.