Root canal treatment is needed if a tooth cavity is left untreated and has reached too deep into the tooth root, causing severe pain. Root canal treatment prevents the infection from spreading to the jaw and causing life-threatening complications. The aim of root canal therapy is to clean the root canals of microbes by mechanical and chemical treatment. At the end of the treatment, the root canals are filled with root fillers that hermetically seal the root canal. The number of root canal treatment visits varies depending on the amount of inflammation under the root and the anatomy of the tooth. After successful root canal treatment, the tooth is restored with a filling material, a contribution or an artificial crown.