There are no hazards associated with crowns for children’s baby teeth, so it is important to first look at why crowns for children’s baby teeth are necessary. The indications for children’s crowns are, first of all, the restoration of large defective teeth, and then the restoration of teeth that are in danger of fracture after endodontic treatment. There are also restorations for hereditary malocclusions, restorations for dental hypoplasia, orthodontic appliances, and fixed retainers. Full crowns for children’s milk teeth are mainly metal preformed crowns, which have the obvious advantage of removing less tooth tissue during dental preparation and easily restoring the shape of the tooth, and easily restoring the proximal and distal mesial diameters of the crown, that is, easily restoring the function of the tooth. To date, no other filling material has been found to be superior in retention to metal preformed crowns for deciduous teeth. Therefore, under routine practice, metal preformed crowns for deciduous teeth do not pose any risk to the child’s mouth. Of course, after a full crown restoration, it is important to pay attention to oral hygiene to prevent localized gum inflammation due to plaque buildup.