Root canal treatment is the removal of the thread-shaped pulp in the center of the tooth. After the damaged pulp is removed from its location, the remaining space should be meticulously cleaned and reshaped and filled. With root canal treatment, it is largely possible to save the tooth without tooth extraction. However, root canal treatment should not be considered as a definitive solution, attention should be paid to oral and dental care, and the condition of the tooth should be kept under control with regular dental examinations.