Dental X-rays are one of the most common questions patients raise, especially anyone worried about radiation. The short answer is that the dose from a typical dental X-ray is very low and the safety measures are well established. This guide explains why dentists use them, what the doses actually look like, and how the risk is kept small.
The short version
X-rays let dentists see problems hidden between teeth, under fillings, and in the bone.
The radiation dose from a typical dental X-ray is very low.
Common types include bitewing, periapical, panoramic, and cone-beam CT.
Low-dose digital sensors, careful beam limiting, and the ALARA principle keep exposure minimal — with shielding used when appropriate.
Tell your dentist if you are or might be pregnant so precautions can be taken.
The benefit of catching problems early usually outweighs the small risk.
Why dentists use X-rays
A visual exam only shows the surfaces a dentist can see and reach. A great deal of what matters happens out of sight: decay starting between two touching teeth, bone loss from gum disease, an infection or abscess at the root, a cyst, or a tooth that is impacted and stuck below the gum. X-rays reveal these hidden areas so problems can be found while they are small and simpler to treat. They are also essential for planning work such as extractions, root canals, and implants. Skipping images entirely can mean a problem is only caught once it becomes painful or more expensive to fix.
The common types
Bitewing: shows the crowns of the upper and lower back teeth in one view. It is the workhorse for spotting cavities between teeth.
Periapical: captures a whole tooth from crown to root tip, useful for checking the root and surrounding bone.
Panoramic: a single wide image that sweeps around the head to show all the teeth, the jaws, and the sinuses at once.
Cone-beam CT (CBCT): a three-dimensional scan used for more complex planning, such as implants or surgery. It gives more detail and uses more radiation than a standard dental X-ray, so it is reserved for cases that truly need it.
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How much radiation is that, really?
We are all exposed to a small amount of natural background radiation every day — from the ground, from the air, from space, and from the food we eat. A useful way to think about a routine dental X-ray is that it typically adds only a small fraction of what you already receive from everyday background sources, on the order of what you might accumulate over roughly a day or so of ordinary life, or comparable in a general sense to the extra exposure from a short airline flight. These are approximate, typical comparisons meant to give a sense of scale, not exact measurements — the real figure depends on the machine, the type of image, and the settings. Modern digital sensors have lowered doses further compared with the older film systems many people remember.
Relative dose by image type
X-ray type
What it shows
Relative dose (approximate)
Bitewing
Cavities between back teeth
Very low
Periapical
A whole tooth and its root
Very low
Panoramic
All teeth, jaws, and sinuses
Low
Cone-beam CT
3D view for complex planning
Higher (still limited, used selectively)
The dose column is a general ranking to show how the types compare with one another. Actual exposure varies by equipment and settings, which is why dentists only take the images a given situation calls for.
The safety measures
Several layers of protection keep exposure as small as possible:
Shielding when appropriate: protective aprons and thyroid collars have long been used to shield the body and thyroid, and many offices still offer them. Updated professional guidance (2023–2024) notes that with modern digital equipment and careful beam limiting, a routine apron is no longer considered necessary in most cases — the biggest dose reducers are low-dose equipment and good technique. Extra shielding is still used when there is a specific reason.
Low-dose digital sensors capture images with less radiation than older film and let the dentist view them instantly.
The ALARA principle — As Low As Reasonably Achievable — guides the whole field: use the least radiation needed to get a usable image.
Taking images only as needed: X-rays are not automatically taken at every visit. How often you need them depends on your age, risk of decay, and dental history, and your dentist tailors the schedule to you rather than a fixed calendar.
Pro tip — you can transfer your records
If you are switching dentists, ask your previous office to send your recent X-rays. Sharing existing images can spare you from repeating them, which reduces exposure and often saves money. Many offices can transfer digital images electronically.
Pregnancy and children
If you are pregnant or think you might be, tell your dentist before any imaging. As a precaution, routine X-rays are often postponed during pregnancy, and if an image is genuinely needed for an urgent problem, extra shielding is used. For children, dentists are especially careful and follow the same ALARA approach, taking images only when there is a clear reason and using the lowest practical settings. In both cases the guiding idea is the same: weigh the benefit of the information against the small exposure, and image only when it will actually change the care.
Can you decline X-rays?
You are always part of the decision, and you can ask why a particular image is being recommended and what it will show. That said, declining necessary X-rays can leave a dentist unable to diagnose or plan treatment safely, a bit like asking a doctor to treat you with their eyes closed. A good conversation usually resolves the concern: the dentist can explain the specific reason for each image so you can make an informed choice together.
Have questions about your care?
Find dentists near you on Dentists At Your Service and ask how they handle imaging and safety.
Typically a very low amount — on the order of a small fraction of the background radiation you already receive from everyday sources. Exact figures vary by machine and image type.
How often do I need dental X-rays?
There is no single schedule. Frequency depends on your age, decay risk, and dental history. Your dentist decides based on your needs rather than taking them at every visit.
Are dental X-rays safe during pregnancy?
Routine images are often postponed during pregnancy as a precaution, and extra shielding is used if an image is truly needed. Always tell your dentist if you are or might be pregnant.
Are they safe for children?
Dentists are especially careful with children, imaging only when there is a clear reason and using the lowest practical settings under the ALARA principle.
Can I decline X-rays?
You can ask why each image is recommended, but declining necessary X-rays may prevent an accurate diagnosis. Talk it through with your dentist so you can decide together.
General educational information only — NOT medical or dental advice. Always consult a licensed dentist about your care. Procedures, costs, and insurance coverage vary by provider and location.
