After pulpal necrosis, you have to come to the hospital and the doctor will make a treatment plan after examination. Generally, pulp necrosis needs two treatments, as follows: 1. After pulp necrosis, root canal treatment is done without anesthesia, and the first root canal preparation is done. The necrotic tissue inside the pulp will be removed, then the root canal will be enlarged with nickel-titanium instruments, rinsed and sealed, and the canal will be rechecked one week later; 2. Next, the last seal will be removed, and the root canal will be filled with root canal filling material, which is commonly used today. After the root canal is filled, the patient is advised to do a full crown restoration or high inlay restoration because the tooth will become brittle after pulpal necrosis and the crown or high inlay will change the way the tooth is stressed and protect the tooth.