Root canals are effective dental techniques used to treat and protect teeth with badly infected roots. The pulp, made of nerve endings and tissues, is the live part of the tooth that stretches into the root. When this area becomes infected, patients start experiencing discomfort and swelling. Root canals take out unwanted parts of the tooth and the infected root. The segment of tooth that remains may be repaired using a cap or crown that allows for fully regained tooth function.