Are Dental X-Rays Safe? Radiation, Frequency and What to Expect (2026 UK Guide)

Last updated: August 2026. Sources: the UK Health Security Agency, GOV.UK, the NHS Business Services Authority, NHS.uk, King's College Hospital NHS Foundation Trust, Guy's and St Thomas' NHS Foundation Trust, the National Institute for Health and Care Excellence, the Scottish Dental Clinical Effectiveness Programme, and the Welsh, Scottish and Northern Irish governments. All radiation and cost figures verified on 17 August 2026.

TL;DR Dental X-rays are safe. UK law requires your dentist to justify every X-ray and keep the dose as low as reasonably practicable, and a routine image delivers only a few days' worth of natural background radiation. There is no fixed schedule, and X-rays can still be taken safely in pregnancy when clinically needed.

Almost everyone who visits a dentist regularly will have an X-ray at some point, yet very few of us are ever told what the radiation actually amounts to, how often we should be having them, or whether it is safe to have one while pregnant. It is a fair question to ask. X-rays use ionising radiation, and it is sensible to want to understand any exposure before you agree to it.

The reassuring answer, backed by NHS guidance and UK radiation law, is that diagnostic dental X-rays involve very low doses and are tightly controlled by regulation. This guide explains exactly how much radiation is involved, the rules that keep it safe, how often you genuinely need X-rays, the different types your dentist might use, what happens in pregnancy, and whether they cost anything extra on the NHS or privately.

Are dental X-rays safe? The short answer

Yes. Dental X-rays are considered safe, and the small amount of radiation they involve is heavily outweighed by the benefit of an accurate diagnosis. Guy's and St Thomas' NHS Foundation Trust puts it plainly: "Although ionising radiation can potentially harm body cells, the dose of radiation in dental X-rays is extremely low." [6]

That safety is not left to chance. Every dental X-ray taken in the UK is governed by law, and your dentist has to justify each one before it goes ahead. The point of an X-ray is to see what an examination alone cannot, decay forming between teeth, infection at the root of a tooth, bone loss from gum disease, or the position of an unerupted wisdom tooth. Catching those problems early usually means simpler, cheaper treatment, so the diagnostic value is real.

None of this means the radiation is nothing. X-rays are a form of ionising radiation, which carries a very small theoretical risk when a large enough dose builds up over a lifetime. The UK system is designed precisely to keep that dose to the minimum needed to get a useful image, which is why the numbers below are so low.

How much radiation is in a dental X-ray?

Radiation dose is measured in units called sieverts, and dental doses are so small that they are usually given in millisieverts (mSv), which are thousandths of a sievert. The clearest way to understand a dental X-ray dose is to compare it to the natural background radiation we are all exposed to every day, from the ground beneath us, the food we eat, the air we breathe and cosmic rays from space.

According to the UK Health Security Agency, the average person in the UK receives about 2.6 mSv of radiation a year from all sources combined, and roughly 85 per cent of that is natural background radiation that has nothing to do with medicine. [4] A dental X-ray adds only a tiny fraction on top of this. The patient information from King's College Hospital NHS Foundation Trust gives the typical figures:

To put that in everyday terms, a single dental X-ray gives you less radiation than you would pick up on a one-way transatlantic flight, which the same NHS source puts at roughly 0.08 mSv from cosmic rays at altitude. [5] The King's College Hospital guidance describes the range across all dental imaging as running "from the equivalent of a few days of natural background radiation to a few months" for the largest three-dimensional scans, which are reserved for complex cases. [5]

The lifetime added risk of a fatal cancer from a single dental X-ray is described in that same NHS guidance as "negligible", less than one in a million, set against the roughly one-in-two baseline lifetime risk of cancer that everyone carries anyway. [5] These are among the lowest-dose examinations in all of medical imaging.

The rules that keep dental X-rays safe

Dental X-rays in the UK are not taken casually. They sit under a statutory framework, the Ionising Radiation (Medical Exposure) Regulations 2017, usually shortened to IR(ME)R 2017, which exists specifically to protect patients. [3]

Two principles from those regulations matter most to you as a patient:

Justification. Before any X-ray is taken, a qualified practitioner has to justify it, meaning they must be satisfied that the benefit of the image to your diagnosis or treatment outweighs the small risk of the radiation. An X-ray cannot be taken just because you are due a check-up. There has to be a clinical reason. King's College Hospital's guidance confirms that IR(ME)R 2017 governs the safe use of ionising radiation and "ensure[s] your X-ray image is justified before it goes ahead". [5]

Optimisation. The dose has to be kept "as low as reasonably practicable" while still producing a diagnostic image, a principle often abbreviated to ALARP. [3] In practice this means modern equipment, digital sensors that need less radiation than old film, and radiographers "trained to take the best possible images using the lowest amount of radiation practicable". [5]

This framework also explains something patients often ask about: why the dentist or nurse steps out of the room, or behind a screen, when the X-ray is taken. It is not because your single exposure is dangerous. It is an occupational safety measure. Dental staff take X-rays many times a day, every working day, so they limit their own cumulative exposure over a career by keeping their distance from each individual exposure, even though the dose to you is very low.

How often should you have dental X-rays?

There is no single answer that applies to everyone, and you should be cautious of any source that gives you a fixed rule like "every year". How often you need X-rays depends on your personal risk of dental problems.

The National Institute for Health and Care Excellence (NICE) sets the framework for how often you should be seen at all. Its guideline on the interval between oral health reviews recommends recall intervals ranging from 3 to 24 months for adults, and from 3 to 12 months for people under 18, with the exact interval decided individually by your dentist based on your risk of tooth decay and gum disease. [7] Patients who have repeatedly shown they can keep their mouths healthy can be moved to the longer intervals over time, up to 24 months. [7]

X-rays follow the same risk-based logic. Someone with a history of decay, several fillings, or active gum disease is likely to need bitewing X-rays more often, so problems are caught early. Someone with excellent oral health and no history of decay may go considerably longer between images. Your dentist reassesses this at each visit rather than working to a rigid timetable, which fits the wider point about how often you should see a dentist being a personal decision rather than a universal rule.

If you are ever unsure why an X-ray is being recommended, it is completely reasonable to ask what the dentist is looking for and how the image will change your treatment. Under IR(ME)R they have to be able to justify it, so the answer should be clear.

The main types of dental X-ray

Not all dental X-rays are the same. The type your dentist chooses depends on what they need to see.

Bitewing. The most common routine X-ray. It shows the crowns of the upper and lower back teeth biting together in a single image, and it is the standard tool for spotting decay developing between teeth, where it cannot be seen or felt directly, and for checking the bone levels around your teeth.

Periapical. A close-up of one or two whole teeth, from the crown all the way down to the tip of the root and the surrounding bone. It is used to investigate pain, check for infection or an abscess at the root, and assess a tooth before treatment such as a root canal.

Panoramic (also called an OPG or DPT). A single wide image that sweeps around the head to capture the entire jaw, all the teeth and the surrounding structures at once. It is used for a broad overview, for assessing wisdom teeth, and for planning orthodontic or implant treatment.

Occlusal. A larger image that captures a wider view of the roof or floor of the mouth than a periapical. It is used to locate unerupted or extra teeth and is more common in children.

Cone beam CT (CBCT). A three-dimensional scan of the jaw, reserved for cases that genuinely need detailed spatial information, such as complex implant planning or assessing an impacted tooth lying close to a nerve. It carries a higher dose than the everyday X-rays above, which is exactly why UK guidance requires it to be individually justified and limited to the smallest necessary area, and why it is not used routinely. [5]

Are dental X-rays safe during pregnancy?

This is one of the most common worries, and it is also one of the most misunderstood. UK clinical guidance is clear that pregnancy on its own is not a reason to avoid a dental X-ray.

The Scottish Dental Clinical Effectiveness Programme states directly that "pregnancy status of the patient is not a contraindication for dental radiographic examination", meaning a dental X-ray can be taken during pregnancy when it is clinically justified. [8] The estimated radiation dose reaching the baby from a dental X-ray is extremely small, put at less than the natural background dose the baby would receive in a single day. [8] The reason is simple: the X-ray beam is aimed at your mouth, not your abdomen, so the developing baby is well away from it.

That same guidance also corrects a widespread myth. Many people assume a pregnant patient will be given a lead apron for a dental X-ray, but current UK guidance states that lead aprons are not required for dental patients, precisely because the abdomen and pelvis are not in the path of the beam. [8]

None of this removes your dentist's judgement. For a non-urgent X-ray, a dentist may still choose to wait until after the birth simply as a precaution, and that is a reasonable clinical decision rather than a sign that an X-ray would be harmful. The key thing is to always tell your dental team if you are pregnant or think you might be, so they can take it into account. This sits alongside the wider picture of dental care during pregnancy, where NHS dental treatment is also free while you are expecting and for a year afterwards.

Do dental X-rays cost extra? NHS and private

On the NHS in England, X-rays do not carry a separate charge. They are part of your examination when the dentist judges them clinically necessary. A Band 1 course of treatment, which covers the examination, diagnosis (including any X-rays needed), advice, and a scale and polish if required, costs a single fee of £27.90 as of April 2026, with Band 2 at £76.60 and Band 3 at £332.10. [1] You do not pay anything on top of the Band 1 fee for an X-ray taken as part of that check-up.

Many people pay nothing at all. NHS dental treatment in England is free if you are under 18 (or under 19 and in full-time education), pregnant or have had a baby in the last 12 months, or receiving certain benefits such as Universal Credit under the income threshold, Pension Credit Guarantee Credit or income-related Employment and Support Allowance, or if you hold a valid HC2 certificate. [2] You can read more about who qualifies for free NHS dental treatment and how the NHS dental charge bands work.

The rest of the UK works differently, so do not assume England's system applies everywhere:

• Wales moved to a fixed care-package fee model from April 2026, capped at £384 for a course of treatment, with a new patient assessment (which includes X-rays where appropriate) charged at £27.21. Exemptions broadly mirror England's, with an additional concession giving free examinations to people aged 60 and over. [9]
• Scotland provides free NHS dental examinations for everyone registered with an NHS dentist, and all treatment is free if you are under 26, pregnant or within 12 months of giving birth, or exempt on income grounds. Other adults pay a contribution towards the cost of treatment. [10]
• Northern Ireland provides free treatment for under-18s (under 19 in full-time education), during pregnancy and for 12 months afterwards, and for people on qualifying benefits, with other adults paying a contribution towards each item of treatment. [11]

Privately, practices handle X-rays in different ways. Some include them in the cost of a private examination or a monthly membership plan, while others itemise a bitewing or panoramic image separately. If you are paying privately, it is always worth asking in advance whether X-rays are included in the quoted examination fee. This is part of understanding what an NHS or private check-up costs before you book.

Can you refuse a dental X-ray?

Yes. As with any procedure, you can decline an X-ray. Under IR(ME)R the dentist has to justify each exposure and explain why they are recommending it, so you are entitled to a clear reason before you agree. [3]

If you do decline, your dentist will explain how that affects their ability to diagnose or treat you. Some problems, particularly decay between teeth or infection at a root, simply cannot be seen reliably without an X-ray, so refusing one may mean the dentist has to work with incomplete information or ask you to reconsider before starting certain treatments. It is your decision to make, but it is worth weighing against the very low dose involved and the diagnostic value you would be giving up.

Frequently asked questions

Are dental X-rays safe? Yes. UK dental practices are legally required under IR(ME)R 2017 to justify every X-ray and keep the dose as low as reasonably practicable. The radiation involved is very low, and NHS guidance describes the added lifetime cancer risk from a single dental X-ray as negligible, less than one in a million. [3] [5]

How much radiation is in a dental X-ray? A single bitewing or panoramic X-ray delivers around 0.01 mSv or less, roughly equivalent to a few days of the natural background radiation everyone in the UK is exposed to anyway. For comparison, the average person receives about 2.6 mSv a year from all sources combined, most of it natural. [4] [5]

How often should I have dental X-rays? There is no fixed schedule. Your dentist decides based on your personal risk of decay and gum disease, within the NICE framework of recall intervals of 3 to 24 months for adults and 3 to 12 months for under-18s. Higher-risk patients need X-rays more often; lower-risk patients need them less. [7]

Can I have a dental X-ray while pregnant? Yes, if it is clinically needed. UK guidance states pregnancy is not a reason to avoid a dental X-ray, and the estimated dose to the baby is less than a single day of natural background radiation. Always tell your dental team you are pregnant so they can factor it into their decision. [8]

Do children need dental X-rays? Sometimes. X-rays help dentists spot decay between baby and adult teeth, check how permanent teeth are developing, and plan orthodontic treatment. As with adults, they are only taken when justified, and the interval is set by risk rather than by routine, within NICE's 3 to 12 month recall framework for under-18s. [7]

Why does the dentist leave the room during my X-ray? It is an occupational precaution, not a sign the exposure is risky for you. Staff take X-rays repeatedly throughout every working day, so they step away or behind a screen to limit their own cumulative exposure over a career, even though the dose from your single X-ray is very low. [5]

Finding a dentist you trust

A good dentist will always explain why an X-ray is being recommended and keep the dose to the minimum needed, exactly as the regulations require. If you are looking for a practice near you, you can search for a dentist in your area on Dentists Closeby and compare the practices covering your postcode. Our guide to finding a good dentist in the UK covers what else to look for when you register.

Sources

1. What are the NHS dental charges? -- NHS Business Services Authority, charges effective 1 April 2026, accessed 2026-08-17
2. Who can get free NHS dental treatment in England -- NHS.uk, last reviewed 11 February 2025, accessed 2026-08-17
3. Ionising Radiation (Medical Exposure) Regulations 2017: guidance -- GOV.UK, updated 4 September 2024, accessed 2026-08-17
4. Ionising radiation: dose comparisons and exposure of the UK population -- UK Health Security Agency, published June 2025, accessed 2026-08-17
5. Dental radiology (adult patients): information for patients -- King's College Hospital NHS Foundation Trust, leaflet PL1045.2, January 2023, accessed 2026-08-17
6. Dental X-rays -- Guy's and St Thomas' NHS Foundation Trust, last reviewed December 2025, accessed 2026-08-17
7. Dental checks: intervals between oral health reviews (CG19) -- National Institute for Health and Care Excellence, accessed 2026-08-17
8. Controlling exposure of patients: radiation protection -- Scottish Dental Clinical Effectiveness Programme, Practice Support Manual, accessed 2026-08-17
9. NHS dental charges and exemptions -- Welsh Government, last updated 27 July 2026, accessed 2026-08-17
10. Help with NHS dental costs -- Scottish Government (mygov.scot), accessed 2026-08-17
11. Dental costs -- nidirect (Northern Ireland Government), accessed 2026-08-17