In neurosurgery, cranial defects are really common, and although they are not considered fatal problems, they can cause more damage if left untreated for a long time. Because the skull is like a defense wall for the brain, it protects the brain, maintains the stable intracranial pressure, and ensures the normal functioning of the intracranial tissues, once the skull defect occurs, all kinds of problems will come out one after another. Some patients may have the question, does the skull have the ability to grow by itself? Will the defective area slowly heal by itself? But the fact is not as simple as imagined, the possibility of the defective part growing up by itself is very small, especially in adults, cranial defects usually cannot heal by themselves, and the phenomenon of collapse and deformation will occur if left untreated for a long time, which will compress the intracranial tissues and cause more harm to health. This is an ancient and classic surgery with thousands of years of development history, and the technology is becoming more and more mature, and the applied repair materials have also been constantly changed and evolved, so patients do not need to worry too much. Currently, many hospitals use titanium mesh material for skull repair surgery. Titanium mesh material is cheap and has some progress compared with those materials in the past, but it also has some shortcomings, such as easy infection and rejection after surgery, cutting pain symptoms, sensitivity of the affected area to the external hot and cold environment after surgery, and even the possibility of material exposure. What happens when the titanium plate is exposed in the skull repair? This means that the surgery is a failure and the patient should go to the hospital promptly for a comprehensive evaluation by a specialist and use a better repair material for a second repair.