What is a root canal?
Above the gum and visible in the mouth is the CROWN of the tooth, Below the gum supporting the crown is the ROOT, The root has a tube running from its tip in the bone to a chamber inside the crown of the tooth, This tube is lined with special cells which made the tooth develop starting at the time of birth. As we get older these cells (ondontoblasts) produce more and more root material and the root canal [tube] gets progressively smaller with age.
Different teeth have differing numbers of roots and a variable number of tubes (or root canals) in each root. Normally, the incisor and canine teeth have one root and one root canal. Premolars can have one or two roots and molars two or three roots, with up to 5 roots canals.