Root canal is repairing a defective or decaying tooth.
The dentist, will first remove the debris of dead tissues and decaying enamel. Then it will be filled with a plasma or latex like substance, and a crown will be placed on top of the teeth as the final procedure!
The method might sound costly for some, but is definitely better than a tooth replacement.
Pulling out a tooth might result in infection, which can become way more painful and costly to treat than a root canal.