Prevention of radiological osteomyelitis, also from the causes of radiological osteomyelitis are: 1, how to achieve the purpose of treatment of tumors, under the premise of radiation dose control, radiological technology in the last 10-20 years, rapid progress, from the earliest irradiation of cobalt-60, to the present to achieve precise targeting, so that the radiation is more effective, more accurate, and for the tumor to kill the efficiency of the tumor is high, and more protective of the surrounding tissues; 2, before planning radiotherapy, to remove the intraoral lesion teeth as much as possible, to prevent these teeth to be extracted and need to be treated once it happens, which may be the main triggering factor. tissues, so this is the most effective prevention; 2, before planning radiotherapy, it is necessary to remove the focal teeth in the mouth as much as possible, to prevent once it occurs later, these teeth have to be extracted and need to be treated, which may be one of the main predisposing factors; 3, once the radiotherapy is completed, if the dental problem occurs, this is the time to carry out the surgical treatment conservatively and on time, to make sure that after the extraction of the teeth, the soft tissues are correctly and completely Coverage.