Pulp necrosis is not necessarily lost. Pulp necrosis often develops from various types of pulpitis, and can also be caused by trauma, temperature, chemical stimulation and other factors. After pulp necrosis, the affected tooth has no self-conscious symptoms, the crown may have deep cavities, or other dental hard tissue diseases, or have fillings, deep periodontal pockets, etc., the crown discoloration is dark yellow or gray and loses its luster, the pulp vitality test has no response, and the X-ray shows that the periapical image of the affected tooth has no obvious abnormality. The best treatment for pulp necrosis is root canal treatment, and pulp necrosis will not fall out in the near future after root canal treatment. If you don’t do root canal treatment after pulp necrosis, although the pulp is no longer painful for a while, there will be a large amount of bacteria and toxins inside the necrotic pulp. When the human body’s resistance is low, the bacteria and toxins will expand to the deeper part of the root of the tooth, causing inflammation around the root of the tooth, and there will be pain and swelling and you can’t eat anything. After pulp necrosis, the color of the tooth will become darker and affect the aesthetics of the tooth, the tooth does not get nutrients, the brittleness increases, and the crown of the tooth is easy to chip off, or the whole crown is completely broken. So pulp necrosis can not be careless, must do perfect root canal treatment, to repair the missing tooth, if necessary, also need to do crown repair, to protect the tooth.