Remaining teeth are of great help in preventing gum recession and providing retention and support for dentures. Therefore, if the base of the remaining tooth is intact, there is no large-scale defect in the shape, and it is helpful for the denture, it will be retained. If the remaining tooth is not in good condition, but it improves after treatment and can provide some retention and support, it should also be retained. If the tooth is severely deviated and loosened, and there is a large area of defect, it should be extracted if it is determined by a doctor that there is no preserved value.