A tooth that is half missing can be considered for a filling, but depending on the size of the defect, x-rays will be taken to determine this. If the defect is large and the nerve has been damaged, a complete root canal treatment is needed first, after which the upper part can be restored with a filling or an inlay or crown, which can prevent the tooth from fracturing. If the defect is small, filling with a high-strength resin can be done routinely. If half of the tooth is missing due to trauma, the tooth should be reviewed frequently, because partial loss of tooth tissue due to trauma is likely to cause subsequent pulpal necrosis, especially the probability of pulpal necrosis within one year is relatively high, which can be reviewed regularly and pulp vitality test can be performed. If the patient finds that the tooth has a tendency to darken, it proves that there is some necrosis of the pulp.