In this article, we review the role of x-rays in the field of dentistry and the most important applications necessary for it in detecting oral and dental diseases, in order to assess the pathological condition suffered by the patient who visits the specialist dentist. It has become normal to conduct x-rays of the teeth periodically or annually for children and adults, since the dentist needs these rays in order to diagnose the type of diseases that the patient suffers from, or because he wants to follow up a specific problem in the teeth and the extent of its development, or in order to identify The results achieved after taking the treatment by the patient. If the patient recently suffers from a specific problem in his teeth, he must most likely undergo a dental x-ray so that the dentist can obtain a complete and clear picture showing what kind of defect occurred in the teeth. Therefore, the dentist will determine whether the teeth can be treated with a specific medication or repaired using a temporary or permanent filling, or both, or if necessary, the tooth must be extracted after exhausting all the solutions to repair and preserve it.