Dental x-rays are used to create a picture of teeth and gums, and the bone and ligaments that hold teeth in place. This picture is called a radiograph, and it is used by dentists to look for disease or check on tooth development that cannot be seen with the naked eye.
Yeah you are right. The benefits of X-rays are well known. They help dentists diagnose common problems, such as cavities, gum disease and some types of infections.