If you have lost half of a large tooth in the back, you should seek medical attention and restoration in a timely manner, first of all, the doctor should examine and determine whether the tooth is still valuable for preservation and treatment. If the tooth has a fractured crown-root joint and the fractured end is located very deep under the gum, it is usually not curable and needs to be extracted promptly, followed by a fixed denture or implant restoration to restore the missing tooth. If the tooth does have value, it usually has an exposed pulp chamber. Therefore, root canal treatment is required to remove the infected pulp nerve and remove the inflammatory material from the root canal cavity, followed by restoration of the tooth tissue, either by inlay, porcelain crown or all-porcelain crown.