There are various types of x-ray. Some show one or two teeth and their roots, while others can take pictures of several teeth at once. The most common x-rays are small ones, which are taken regularly to keep a check on the condition of the teeth and gums.
These show a few teeth at a time, but include the roots and surrounding areas. There are large x-rays that show the whole mouth, including all the teeth and the bone structure that supports the teeth. These are called panoramic x-rays.
There are also medium-sized x-rays, which show either one jaw at a time, or one side of the face. There are also electronic ‘imaging’ systems in use today. These use electronic probes instead of x-ray films and the picture is transmitted directly onto a screen.