Person smiling for a dental X-ray guide

Published March 22, 2026Written by Landmark Dental Care

How Do Digital Dental X-rays Work?

Digital dental X-rays use a sensor or phosphor plate to capture an image of teeth and supporting structures, then display that image on a computer for diagnosis and planning. A dentist recommends images when the information could change care—not automatically at every visit. This article explains the imaging process in general terms; it does not list unverified machine brands, dose numbers or clinic-specific equipment claims.

Key Takeaways

  • A digital dental X-ray captures attenuation of an X-ray beam with a sensor or plate and converts it into a viewable digital image.
  • Images are prescribed after clinical judgment about what question needs answering.
  • Dentists use radiographs to see structures that a visual exam alone may miss, such as areas between teeth or around roots.
  • Patients usually feel brief positioning and a short exposure; discomfort varies with anatomy and the type of view.

How a digital sensor captures an image

Dental radiography begins with a controlled X-ray beam directed toward a small region of the mouth. Tissues absorb the beam differently: denser structures such as enamel and metal restorations typically appear lighter on the resulting image, while less dense areas appear darker. That contrast is what allows a clinician to examine teeth, restorations and bone patterns.

In digital systems, the receptor is either a solid-state sensor placed in the mouth or a phosphor plate that is scanned after exposure. Instead of chemical film development, the receptor’s signal is processed into a digital file. The American Dental Association notes that digital receptors are among the options used in modern dental radiography and that once imaging is justified, exposure should be kept as low as reasonably achievable for the diagnostic task.

Digital capture does not remove the need for justification. The Canadian Dental Association’s position on control of X-radiation in dentistry states that radiographs should be based on clinical examination and a need for information that could contribute to diagnosis or treatment planning. Suitable recent images should be considered before new exposures are made.

Different views answer different questions. Bitewing images often help evaluate contact areas between back teeth. Periapical images show a tooth from crown toward the root tip. Extraoral views, when used, show broader relationships. The team selects the view for the clinical question rather than taking every possible image by default.

This explanation is conceptual. Exact sensors, software interfaces and workflow details vary by practice and should be confirmed with the dental team if you have specific questions about what will be used at your visit.

What happens during the appointment

Imaging usually follows a review of concerns and a clinical look at the area in question. The dental professional explains which images are proposed and why. You can ask what the image is expected to show and whether existing radiographs from another office could be transferred instead of repeating exposures.

For intraoral images, a sensor or plate is positioned beside the teeth. A holder often stabilizes the receptor and helps align the beam. You may be asked to bite gently on a positioning device. For some extraoral images, you stand or sit while the machine moves around your head; stay still as instructed.

Shielding practices, such as protective aprons or thyroid collars when appropriate for the exam type and patient factors, follow professional judgment and current guidance. Ask the team what protective measures they use for your specific images.

The exposure itself is brief. The team then checks whether the image is diagnostically acceptable. A retake may be needed if the receptor moved, the angle was incorrect or the image does not answer the clinical question. Retakes should be limited to what is necessary.

If you are pregnant, think you might be pregnant, or have had recent dental or medical imaging elsewhere, tell the team before radiographs are taken. That information supports justification and coordination of care.

How dentists use the image

A radiograph is a diagnostic aid, not a standalone verdict. The dentist interprets the image together with your symptoms, clinical findings and history. Magnification, contrast adjustment and side-by-side comparison with earlier images—when available—can help the clinician evaluate changes over time.

Common reasons to review a digital dental X-ray include checking for decay between teeth, assessing bone levels around teeth, evaluating the area around a root tip, examining the fit of existing restorations, or planning treatment where underground structure matters. The image may rule a problem in, rule one out or show that monitoring is reasonable.

Radiographs have limits. Early enamel changes, some cracks and certain soft-tissue conditions may not be fully visible on a standard dental X-ray. Additional tests, clinical probing, different image types or referral may still be needed. A clear radiograph does not guarantee that every possible condition is absent.

When findings are explained, ask the dentist to point to the area of interest on the screen and describe how certain the interpretation is. Understanding the “why” behind a recommendation is part of informed discussion about next steps.

For service-level information about imaging at the practice, see digital dental X-rays.

Storage, records and follow-up comparison

Digital images become part of the dental record. Secure storage supports continuity of care, insurance documentation when applicable and comparison at future visits. Practices follow privacy and record-keeping obligations applicable in their jurisdiction; ask the front desk how records are shared if you change providers.

Comparison with earlier radiographs is one reason to avoid unnecessary duplicate exposures. If you recently had images taken elsewhere, request a transfer so the dentist can determine whether new images are still needed. The FDA and ADA emphasize reviewing imaging history as part of justifying examinations.

Follow-up imaging intervals are individualized. There is no universal calendar that requires bitewings every set number of months for every patient. Risk of decay, periodontal status, symptoms, age and previous findings all influence timing. The ADA states that radiographic timing depends on current oral health needs rather than a one-size-fits-all schedule.

If a new problem appears between visits—pain, swelling, trauma—the dentist may recommend targeted images sooner than a routine recall interval. Conversely, a low-risk patient with recent adequate images may not need repeats at the next checkup.

What patients typically feel

Most people describe digital dental X-rays as quick. The main sensations are pressure from the sensor or plate and the need to hold still. Sensors can feel bulky, especially in smaller mouths or near the back teeth. Tell the team if you have a strong gag reflex; positioning adjustments, breathing through the nose and brief pauses often help.

There is no lingering “radiation feeling” after a dental exposure. Anxiety is common and worth mentioning in advance so the team can explain each step. Children and people with limited mouth opening may need extra time for comfortable positioning.

Discomfort is not the same as harm from the imaging decision. Conversations about necessity, alternatives and protective measures belong before the exposure whenever practical. Afterward, ask whether the images were adequate and whether any findings require treatment, monitoring or another type of image.

Digital dental X-rays turn brief, targeted exposures into pictures that support—not replace—clinical judgment. The most useful patient question is what the image will help decide.

FAQ

Are digital dental X-rays the same as medical CT scans?

No. Routine digital dental X-rays are small-field dental radiographs for teeth and supporting structures. Medical CT and dental CBCT are different technologies used for different clinical questions and are not interchangeable with bitewing or periapical images.

Do digital X-rays hurt?

Most patients feel brief pressure from positioning rather than pain from the exposure itself. Tell the dental team if sensor placement is difficult so they can adjust technique or timing.

Why might an image need to be retaken?

Movement, incorrect angulation or an image that does not show the area of concern can require a retake. Retakes should be limited to what is needed for a diagnostically useful result.

Next step

To learn about digital dental imaging at Landmark Dental Care, call 902-893-2919 or ask about radiographs during your examination at 125 Queen St in Truro. Imaging recommendations should always be tied to your individual clinical needs.

References

This article provides general educational information and is not a diagnosis or a substitute for care from a dentist or other qualified health professional. It does not specify radiation dose values or practice equipment.