If you want to wear braces for decayed teeth, you need to remove the decayed part of the tooth, and then check whether the remaining tooth can be repaired by applying filling material. If it can be repaired, and it can get a good resistance shape and retention shape, and it will not fall off in use just repair can be done. If the scope of tooth decay is large, it is necessary to wear braces. Generally, after removing the decayed material from the decayed tooth, then remove a layer of hard tissue on the outside of the decayed tooth, make a crown by taking an impression with impression material, and finally apply adhesive to the crown and wear it on the corresponding prepared tooth tissue.