Root canal is part of your teeth’s inner structure. It extends from the top surface all way down to where there would be no enamel, dentin or pulp if we were talking about human skin! The function for this area in our mouth gets different as time goes on; at first it’s just meant a place where bacteria can attach themselves so they don’t cause disease elsewhere within you oral cavity but later becomes more involved when these same microorganisms start performing tasks such executing basic maintenance work like cleaning up food particles stuck between file layers inside their bristles.