The brain is the commander of the human body, which governs all organs and tissues of the body and supports all life activities. This command requires strong protection, which is the outer layer of brain tissue, the skull. Without the protection of this hard shell, the brain tissue and head and facial organs may be easily damaged, endangering the life and health of a person. Therefore, once a skull defect occurs, it should be repaired promptly. Cranial defect is a relatively common disorder, which can be caused by many reasons in life, such as falling objects, traffic accidents, craniofacial surgery and so on. Accordingly, cranial repair is a relatively routine procedure in modern medical neurosurgery and the technique is very mature. Although it is routine and mature, it is a surgery after all, and it still holds the hearts of patients and their families. Some patients have asked how to maintain the skull after the repair. For this question, it still has a lot to do with the repair material. Choosing a good repair material will be more conducive to the post-operative recovery. For example, the PEEK material, also called polyether ether ketone material, which has been widely used in some large hospitals in Beijing, can achieve a very satisfactory repair effect, and basically no special maintenance is needed after the skull is patched with this peek material.