Endodontics is a branch of dentistry which is especially concerned with the study and treatment of dental pulp. Some of the procedures done by an endodontists are root canal therapy, endodontic retreatment, cracked teeth treatment and dental trauma treatment. To pursue this degree, a regular dentist must take another level of training and continue further research in this field. 
Root canal therapy is one of the most common dental procedures done by endodontist. However, if the pulped is severely damaged or undergoing a disease, endodontic treatment is necessary to save the teeth and prevent it from total decay. The pulp treatment covers the nerves, arterioles, venules, lymphatic tissue and fibrous tissue of the teeth. 
An x-ray is usually required before the patient undergo endodontic treatment. It can help show the fracture or unseen canals. The good thing about this treatment is it can also treat the adjacent tooth thus keeping the damage to a minimum and another way of preventing it.