It is often asked that teeth after root canal treatment or “rotten nerve” treatment are especially prone to fracture, what is the reason? After the tooth decay, if not treated in time, the bacteria will further erode your tooth by its way until the deep tissue of the tooth, and the pulp inflammation will appear. Once the pulp inflammation occurs, it is more difficult to save the healthy pulp of the tooth. In order to save the affected tooth, in many cases, the only way is to inactivate the pulp tissue, which is commonly known as root canal treatment and “rotten nerve” treatment. The nutrition of the tooth comes from two sources: first, the pulp tissue, composed of blood vessels, fibers and cells inside the tooth, provides the tooth with nutrients directly. The other way is through the soft tissues surrounding the tooth, whose nutrients can penetrate into the tooth. After deactivated endodontic treatment, the tooth is deprived of the nutrient supply from the pulp and can only rely on the soft tissues around the tooth alone to provide nutrients. Such a tooth is relatively brittle and is prone to fracture when chewing hard objects. On the other hand, the teeth that need to be treated by endodontic therapy, the original tooth defect is larger, when treating, not only the decayed tooth tissue has to be removed, but also part of the normal tooth tissue has to be removed for endodontic therapy, which further reduces the bearing capacity of the teeth. If there are too steep cusps on the affected teeth, the weak tooth tissues left by more missing teeth will be more likely to make the treated teeth fracture. When chewing, care should be taken not to use the tooth to bite on anything too hard to reduce the chance of tooth fracture. The way to prevent a tooth from fracturing after root canal treatment is to have a porcelain tooth made on the outside of the tooth to protect it!