Oral x-ray one-time imaging is an intraoral x-ray apical film that is used to look at the pulpal condition, alveolar bone resorption, and apical condition of the teeth. Oral x-ray one-time imaging is an intraoral x-ray apical film, commonly used as an auxiliary examination during oral checkups to observe the pulpal condition, alveolar bone resorption, and apical condition of the teeth. It can be taken for 3~4 teeth at a time, and each time it is taken, there will be a micro-dose of radiation, which is prohibited for pregnant women and other patients. 1. When used to check the dental pulp, it can observe whether there is caries on the neighboring surface of the tooth and the heel surface, and the lesion area is in low-density image when caries is present, so that it can observe whether there is any point of pulp exposure at the location of caries, and it can also be used to locate the root canals during the treatment period, test the tip of the tooth before root filling, and observe whether the root filling is in place after filling the tooth, which can be used as the basis of auxiliary examination to inform the patient of the cause of the disease and the condition of the tooth. 2. When used to check the root tip, it can observe whether there are cysts and abscesses in the root tip of the affected tooth, and can promptly find out the invisible condition under the root tip. 3. When used to check alveolar bone resorption, it is mostly used as an auxiliary examination for periodontitis patients, which can determine the degree and direction of alveolar bone resorption, and can better formulate the treatment plan. Oral X-ray primary imaging radiation dose and its tiny, shooting will have a lead suit and other protective gear to wear, such as can not shoot to communicate with the doctor in a timely manner.