X-ray is an electromagnetic radiation with a wavelength ranging from 10 picometres to 10 nanometers, and it is a common method which helps doctors to see inside your body without the need for surgery. <br />There is no doubt that the use of radiographs in various fields of medicine will help in the diagnosis and treatment planning of diseases whether in children or adults.<br /> The importance of the X-rays in the dentistry is not less than its importance in other fields of medicine, but on the contrary, it is often impossible to complete dental treatment plan without resorting to radiography.<br />Dental x ray is a necessary step to diagnose the problems of the mouth and various teeth that are not diagnosed during routine clinical examination, and also help to determine the appropriate treatment option.<br />In this article we will learn about the most common types of dental radiography and their uses. <br />The most famous and commonly used type of intraoral radiation is the type called Periapical X-rays which visualize all parts of the tooth, detect caries, gum disease, bone loss or anything abnormal surrounding the tooth and is the first choice for dentists. Bitewing rays are another type of intraoral imaging, and it reveals caries between the teeth and the condition of the alveolar crest <br />On the other hand, Panoramic rays are one of the most famous types of extraoral imaging, and give a complete picture of the oral cavity, including the upper and lower teeth, jaw joints, nerves, sinuses and supporting bones in one image, and one of the uses of panoramic dental rays: Detection of the presence of decay in all jaw teeth. Detection of fractures of the jaws. Detection of cancerous lesions. Detection of root shapes and directions, which is useful in the extraction process, especially wisdom tooth extraction. Examination of the temporomandibular joint. Diagnosis of orthodontic problems.<br /> <br />Cephalometric is extraoral imaging that gives a lateral view of face and widely used in orthodontic cases.<br />Sometimes the dentist may need to use three-dimensional x-ray techniques when it is not possible to reach a correct diagnosis or to complete the work using previous 2D techniques<br />CT scan is a type of scan that gives cross-sectional images of the body in many directions in addition to the three-dimensional image, this type is used to find problems in the bones of the face such as abscess, tumors, and fractures. It also helps guide the process of dental implants and remove tumors in the mouth and face.<br />Cone Beam CT (CBCT) has been developed as a modification of CT scan, It is one of the latest technologies and characterized by a much lower radiation than the CT scan, and the size of the device is relatively small and can be used inside the dental clinic. This type helps in creating 3 -dimensional images of dental structures, soft tissues, nerves, and bones. It is commonly used in providing a high-resolution image in dental implants, lifting tumors and impacted teeth, complicated root fillings and gum disease<br />