Are Dental x-rays safe? Everything you need to know

29th September 2026

If your dentist has recommended a dental X-ray, you may have wondered: are dental X-rays safe? It is completely understandable to have questions about radiation and whether having an X-ray could be harmful.

The good news is that modern dental X-rays use a very small amount of radiation and are considered safe when they are clinically necessary and taken appropriately. Dental X-rays are an important part of modern dentistry because they allow your dentist to see areas that cannot be examined during a routine dental examination.

At Knightsfield Dental Practice in Welwyn Garden City, we only recommend dental X-rays when they are clinically appropriate and when the information they provide can help with your dental care.

What is a dental X-ray?

A dental X-ray uses a small amount of radiation to create an image of your teeth, roots and surrounding bone. Unlike a standard dental examination, an X-ray can show what is happening beneath the surface.

For example, dental X-rays can help your dentist identify:

  • Tooth decay that cannot be seen during a visual examination
  • Problems below existing fillings or crowns
  • Infections around the root of a tooth
  • Changes to the jawbone
  • Impacted or developing teeth
  • Bone loss associated with gum disease
  • The position of teeth before certain dental treatments
  • Problems that may not yet be causing symptoms

This means dental X-rays can help your dentist diagnose problems earlier and plan the most appropriate treatment.

How much radiation is in a dental X-ray?

One of the most common concerns about dental X-rays is radiation exposure.

Modern dental X-ray equipment uses a very low dose of radiation. The exact amount depends on the type of X-ray being taken, but exposure from a dental X-ray is generally very small.

For perspective, we are exposed to naturally occurring background radiation every day from the environment around us. Dental X-rays add only a small amount to this exposure.

Digital dental X-ray technology has also helped reduce radiation doses compared with older film-based systems.

Are dental X-rays harmful?

When dental X-rays are taken using appropriate equipment and techniques, the level of radiation exposure is very low.

As with any exposure to ionising radiation, dentists follow the principle of using the lowest reasonable dose necessary to obtain the diagnostic information required.

Your dentist will consider factors such as your dental history, age, symptoms and previous X-rays before deciding whether another X-ray is necessary.

This is why you may not need an X-ray at every dental appointment.

How often should you have dental X-rays?

There is no single schedule that applies to everyone.

How often you need dental X-rays depends on your individual oral health and your dentist’s clinical assessment.

Someone with a low risk of dental disease may need X-rays less frequently, while someone with a higher risk of tooth decay, gum disease or other dental problems may need them more regularly.

Your dentist will consider your individual circumstances rather than taking X-rays simply because a certain amount of time has passed.

Do children need dental X-rays?

Sometimes.

Children may need dental X-rays to monitor developing teeth, check the position of permanent teeth or investigate areas that cannot be assessed adequately during a visual examination.

Because children are more sensitive to radiation than adults, dentists take particular care to ensure that an X-ray is clinically justified and that exposure is kept as low as reasonably achievable.

Are dental X-rays safe during pregnancy?

If you are pregnant or think you may be pregnant, always tell your dentist before having an X-ray.

Dental X-rays may sometimes be necessary during pregnancy, particularly if there is a dental problem that requires diagnosis. Your dentist will carefully consider whether the X-ray is needed and will take appropriate precautions to minimise radiation exposure.

Importantly, delaying necessary dental treatment can sometimes allow a dental problem to become more serious. Your dentist can discuss the benefits and risks with you and explain why an X-ray may or may not be recommended.

Why does my dentist need an X-ray if my teeth don’t hurt?

Dental problems do not always cause symptoms straight away.

You can have tooth decay, bone loss, an infection or another dental problem without experiencing pain. An X-ray can sometimes identify changes before they become obvious during a routine examination.

This is one reason why dental X-rays can be a valuable diagnostic tool. They give your dentist additional information that cannot be obtained simply by looking at your teeth.

Are dental X-rays necessary before every treatment?

Not necessarily.

Your dentist will assess whether an X-ray is required based on the treatment you are considering and your individual circumstances.

For some treatments, an X-ray can provide important information about the health and position of your teeth, roots and surrounding bone. For other situations, an X-ray may not be necessary.

At Knightsfield Dental Practice, we take a patient-centred approach and only recommend X-rays when there is a clinical reason for doing so.

What happens during a dental X-ray?

Dental X-rays are quick and straightforward.

Depending on the type of X-ray required, you may be asked to bite gently onto a small holder.

You will need to remain still while the image is taken. The actual exposure takes only a very short time.

Your dentist can then examine the image alongside your clinical examination and use the information to help diagnose any problems and plan your treatment.

Are digital dental X-rays safer?

Modern digital dental X-ray systems can provide high-quality images using a low radiation dose.

Digital images can also be viewed quickly, enlarged and enhanced where appropriate, helping your dentist assess specific areas in greater detail.

However, the important point is not simply whether an X-ray is digital. The X-ray should be clinically justified and taken using appropriate equipment and techniques.

What are the benefits of dental X-rays?

Although people understandably focus on radiation exposure, it is also important to consider the benefits of dental X-rays.

They can help your dentist:

  • Detect problems that cannot be seen during a routine examination
  • Diagnose dental infections
  • Identify hidden tooth decay
  • Assess bone levels
  • Check developing or impacted teeth
  • Assess teeth before certain treatments
  • Monitor changes over time
  • Plan treatment more accurately

Early diagnosis can sometimes mean that dental problems can be treated before they become more complicated.

So, are dental X-rays safe?

Yes. Dental X-rays are considered safe when they are clinically necessary and appropriate precautions are taken.

Modern dental X-ray equipment uses very low levels of radiation, and your dentist will consider whether an X-ray is necessary before recommending one.

If you have concerns about dental X-rays, don’t be afraid to ask your dentist. We can explain why an X-ray has been recommended, what information it will provide and how it will help with your dental care.

Dental X-rays in Welwyn Garden City

At Knightsfield Dental Practice in Welwyn Garden City, we use dental X-rays as an important diagnostic tool when clinically appropriate. Our team will always explain why an X-ray is recommended and answer any questions you may have.

If you would like to find out more about dental X-rays or would like to arrange an appointment, contact Knightsfield Dental Practice in Welwyn Garden City and our friendly team will be happy to help.

Frequently Asked Questions

How much radiation do you get from a dental X-ray?

Dental X-rays use a very small amount of radiation. The exact dose varies depending on the type of X-ray required, but modern dental X-ray equipment is designed to minimise radiation exposure while producing the diagnostic information your dentist needs.

Can dental X-rays cause cancer?

Dental X-rays use ionising radiation, which can carry a small theoretical risk. However, the radiation dose from modern dental X-rays is very low. Dentists therefore only recommend X-rays when they are clinically justified and take steps to minimise unnecessary exposure.

How often should I have dental X-rays?

Your dentist will decide how often you need X-rays based on factors such as your oral health, dental history, age and risk of dental disease.

Can I refuse a dental X-ray?

You can discuss any concerns with your dentist before having an X-ray. Your dentist can explain why they are recommending it and what information they need. You can then make an informed decision about your care.

Are dental X-rays safe for children?

Dental X-rays can be used safely in children when they are clinically necessary. Dentists take particular care with children and only recommend an X-ray when the expected diagnostic benefit justifies the radiation exposure.


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Patrick C

I recently had some dental issues with broken teeth and saw Maya for a check-up. Maya gave me options to get my teeth repaired, and I now have 2 lovely new white fillings. I had also misplaced my denture, and Maya made me a new one, which fits so well and is so comfortable. The treatment from start to finish was explained in detail, and I’m really happy with the final results. I highly recommend this dental practice and am pleased to have found such a friendly, helpful team.

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Justin S

Today I had the ‘pleasure’ of a shiny new filling by Nishma, who has become a bit of a household name around here! The kids love her, and now, I have to pretend to be “Dentist Daddy” when brushing their teeth (inspired by Nishma)!

Zero pain.
100% friendliness.
On time.
In and out in 30 minutes.

As always, a lovely experience. Well, aside from the bill, I guess, but thanks to the UK Govt, we have to pay for dental treatment these days, and Nishma’s expertise comes at a fair and appropriate cost. Thanks, Nishma (and your lovely colleague) for a smooth experience (and smooth filling too)!

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Nicola W

So grateful for the care and attention given at this practice every time I attend. Most recently to Maya, Ishira and Sarah for their patience, care in getting me seen and treated as quickly as possible. The phone call to check on me the next day is such a lovely touch; I have never had that at any other dental practice before. Highly recommend this practice!

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Isabelle B

Very professional team. Always on time. Very clean premises. Friendly staff. They seem up-to-date with new techniques and equipment. They take pride in their work. I have had several dentists at this practice over the years, but they are all very good at their job. Can recommend.

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Eric D

Recently changed my dentist to a local one and I have found all the staff here very friendly, caring and most importantly, understanding in terms of my ongoing oral health care. Treatment has been exceptional, easy and importantly pain pain-free and appropriate. Thank you, Anita, Maya and the team.

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Anthony B

Excellent friendly practice, treatment was very good and painless, everything was explained, and great care was taken to ensure my comfort. Good ambience in the waiting room, the appointment was on time. Recommended.

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Ann WR

Totally recommend this Dental Surgery! Maya and her team were very professional and kind. I cannot express how grateful I am to have new crowns and a bridge so that I can smile with confidence. They talked me through every stage, and the final result was brilliant.

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Margo L

Always delighted with the results of any treatment I receive. Face may crumble with age, but my smile shows the benefit of long years of care from Knightsfield Dental Practice.

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Wendy H

Since Anita has been taking care of my teeth, I have been highly satisfied with Knightsfield Dental Practice. She is always bright, positive, caring and very clear about treatment options, which she executes professionally and well. Love my visits now.

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Stuart W

I had an old filing replaced. The procedure was delivered very well, and in a nice, calm atmosphere. The anaesthetic took quite a long time to ease off – more like 4 hours before I could feel my bottom lip and cheek, but I’d rather that than feel the procedure (which I didn’t).

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Nick B

Highly recommend the service at the dentist. Thoroughly professional in the explanation and treatment of my teeth. A great experience, thank you!

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Clare A

I had an old filling that had to be replaced, and I had the treatment today. I can honestly say it was the most relaxing treatment; I didn’t feel a thing, and the dentist and her dental nurse were brilliant.

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Steven W

My treatment was concisely explained from start to finish, including aftercare. I was reminded of each appointment both by phone and email. The professionalism and diligence of Maya, Sarah and all staff were faultless.

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Karen J

I had to go to this practice as an emergency, being a very nervous patient, I can not tell you how nice they were. The dentist informed me of what treatment should be done, and the dental nurse was lovely and held my hand throughout the tooth extraction; they even gave me a coping strategy to use. Cannot recommend them enough, all staff were lovely and friendly.

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Patrick C

I recently had some dental issues with broken teeth and saw Maya for a check-up. Maya gave me options to get my teeth repaired, and I now have 2 lovely new white fillings. I had also misplaced my denture, and Maya made me a new one, which fits so well and is so comfortable. The treatment from start to finish was explained in detail, and I’m really happy with the final results. I highly recommend this dental practice and am pleased to have found such a friendly, helpful team.

star blue green plain icon
google blue red yellow green plain icon

Justin S

Today I had the ‘pleasure’ of a shiny new filling by Nishma, who has become a bit of a household name around here! The kids love her, and now, I have to pretend to be “Dentist Daddy” when brushing their teeth (inspired by Nishma)!

Zero pain.
100% friendliness.
On time.
In and out in 30 minutes.

As always, a lovely experience. Well, aside from the bill, I guess, but thanks to the UK Govt, we have to pay for dental treatment these days, and Nishma’s expertise comes at a fair and appropriate cost. Thanks, Nishma (and your lovely colleague) for a smooth experience (and smooth filling too)!

star blue green plain icon
google blue red yellow green plain icon

Nicola W

So grateful for the care and attention given at this practice every time I attend. Most recently to Maya, Ishira and Sarah for their patience, care in getting me seen and treated as quickly as possible. The phone call to check on me the next day is such a lovely touch; I have never had that at any other dental practice before. Highly recommend this practice!

star blue green plain icon
google blue red yellow green plain icon

Isabelle B

Very professional team. Always on time. Very clean premises. Friendly staff. They seem up-to-date with new techniques and equipment. They take pride in their work. I have had several dentists at this practice over the years, but they are all very good at their job. Can recommend.

star blue green plain icon
google blue red yellow green plain icon

Eric D

Recently changed my dentist to a local one and I have found all the staff here very friendly, caring and most importantly, understanding in terms of my ongoing oral health care. Treatment has been exceptional, easy and importantly pain pain-free and appropriate. Thank you, Anita, Maya and the team.

star blue green plain icon
google blue red yellow green plain icon

Anthony B

Excellent friendly practice, treatment was very good and painless, everything was explained, and great care was taken to ensure my comfort. Good ambience in the waiting room, the appointment was on time. Recommended.

star blue green plain icon
google blue red yellow green plain icon

Ann WR

Totally recommend this Dental Surgery! Maya and her team were very professional and kind. I cannot express how grateful I am to have new crowns and a bridge so that I can smile with confidence. They talked me through every stage, and the final result was brilliant.

star blue green plain icon
google blue red yellow green plain icon

Margo L

Always delighted with the results of any treatment I receive. Face may crumble with age, but my smile shows the benefit of long years of care from Knightsfield Dental Practice.

star blue green plain icon
google blue red yellow green plain icon

Wendy H

Since Anita has been taking care of my teeth, I have been highly satisfied with Knightsfield Dental Practice. She is always bright, positive, caring and very clear about treatment options, which she executes professionally and well. Love my visits now.

star blue green plain icon
google blue red yellow green plain icon

Stuart W

I had an old filing replaced. The procedure was delivered very well, and in a nice, calm atmosphere. The anaesthetic took quite a long time to ease off – more like 4 hours before I could feel my bottom lip and cheek, but I’d rather that than feel the procedure (which I didn’t).

star blue green plain icon
google blue red yellow green plain icon

Nick B

Highly recommend the service at the dentist. Thoroughly professional in the explanation and treatment of my teeth. A great experience, thank you!

star blue green plain icon
google blue red yellow green plain icon

Clare A

I had an old filling that had to be replaced, and I had the treatment today. I can honestly say it was the most relaxing treatment; I didn’t feel a thing, and the dentist and her dental nurse were brilliant.

star blue green plain icon
google blue red yellow green plain icon

Steven W

My treatment was concisely explained from start to finish, including aftercare. I was reminded of each appointment both by phone and email. The professionalism and diligence of Maya, Sarah and all staff were faultless.

star blue green plain icon
google blue red yellow green plain icon

Karen J

I had to go to this practice as an emergency, being a very nervous patient, I can not tell you how nice they were. The dentist informed me of what treatment should be done, and the dental nurse was lovely and held my hand throughout the tooth extraction; they even gave me a coping strategy to use. Cannot recommend them enough, all staff were lovely and friendly.

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