A dental X-ray is not always the same test. Some images provide a close look at a tooth and its surrounding structures; others show the jaws more broadly; and some provide a three-dimensional view. Rather than asking which test is generally best, it may be more helpful to ask your dentist which clinical question an image is intended to answer. The choice depends on your dental history, the clinical examination and any imaging you have already had.

Why might a dentist recommend an X-ray?

A clinical examination can reveal many findings, but roots and structures beneath the surface may need further assessment. An X-ray can add information that helps the dental professional understand a problem or plan care. However, imaging is not an automatic part of every visit. The 2026 ADA/AAOMR consensus recommendations emphasize individual clinical assessment and review of previous images before new radiographs are prescribed.

Periapical X-rays: focusing on a tooth and its roots

A periapical image is a form of intraoral dental X-ray: a small receptor is placed inside the mouth. It can show a tooth from crown to root and a portion of surrounding bone. Dentists may use it when the question concerns a particular tooth or region. An image must still be interpreted alongside the history and examination rather than treated as a diagnosis in isolation.

Bitewing X-rays: looking between the teeth

Bitewings are another intraoral technique. They are especially useful for showing the crowns of upper and lower back teeth together and the areas between adjacent teeth. Depending on the clinical question, they can contribute information about changes that may be difficult to see directly, as well as aspects of supporting structures. Their frequency should reflect individual findings and risk, not a fixed interval for everyone.

Panoramic X-rays: a broader overview

A panoramic dental radiograph is obtained from outside the mouth while an imaging system moves around the head. It gives a broad view of the teeth, jaws and related bony structures. This can help with certain clinical questions but does not replace close-up images in every situation. A wider field of view is not automatically more useful for assessing the details of a particular tooth.

Cone-beam CT (CBCT): 3D information in selected situations

Cone-beam computed tomography provides three-dimensional information about dental and jaw structures. It may be considered for specific indications when clinical examination and conventional two-dimensional imaging cannot adequately answer a question. It is not a routine test to request before every treatment or estimate. Professional recommendations advise using CBCT judiciously, with an imaging field appropriate to the information needed.

Radiation protection: making every exposure purposeful

Dental X-rays use ionising radiation. Radiation protection aims to avoid unnecessary exposures and optimize those that are justified, while preserving the benefits of medically useful imaging. European radiation-protection principles include justification and optimization. The practical message for patients is that an examination should answer a relevant question, rather than simply being repeated for convenience. Reviewing previous images can also help prevent unnecessary duplication.

Have you had dental imaging before?

Tell the dental practice whether you already have panoramic images, intraoral X-rays, CBCT images or reports. If possible, provide their dates and ask how to share them securely. The dentist may be able to use previous results, although new imaging can still be appropriate when existing images are not adequate for the current clinical purpose. Do not send identifiable clinical images through an unverified public channel.

For an appointment checklist, see the guide to preparing for a first dental visit (in Italian).

Five questions worth asking

  1. What clinical question would this image help answer?
  2. Could previous images or reports be sufficient?
  3. Would a two-dimensional image provide the information needed?
  4. How could the finding influence the assessment or treatment planning?
  5. How will I receive a copy of the image and report, and who will have access to them?

Frequently asked questions

Are dental X-rays mandatory at the first appointment?

No. The decision depends on the clinical assessment.

Is CBCT always preferable because it is 3D?

No. Additional detail is useful only when clinically justified.

Is there a fixed schedule for repeating X-rays?

No. The clinician considers your history, examination, risk and previous imaging.

Medical caution and next steps

This is general educational information, not individual advice to have or avoid an X-ray. Tell the clinician about relevant medical circumstances, previous imaging, possible pregnancy or other concerns so the examination can be considered appropriately. An X-ray supports clinical judgment; it does not provide a standalone diagnosis or a treatment quotation.

Sources consulted on 2 November 2026