Why Do You Need Dental X-Rays? What They Show and How Much Radiation They Use

A dental X-ray is useful when it can answer a question that an examination alone cannot, such as what is happening between teeth or around a root (ADA, dental X-rays). Ask what the dentist is trying to find out in your case.

The type of image should follow that question. You can ask which teeth or structures it will show, how the result could change treatment and whether recent images from another practice can be used. Let the team know where and when earlier images were taken so they can consider their usefulness.

You can also ask about the cost before agreeing and whether the image is included in your booked visit. If you prefer to wait, ask what information would remain uncertain and what that means for the decision in front of you. X-rays are not a replacement for an examination, and the fact that a machine is available is not the reason to use it.

• Australian Dental Association. Dental X-rays

Dental X-rays do not need to follow the same fixed timetable for everyone. The ADA says the interval depends on your dental condition and risk of future problems (ADA, dental X-rays). A check-up appointment does not automatically mean a new set is needed.

Ask which previous images the dentist has, what has changed since they were taken and what another image would add. If you have moved practices, supplying the earlier dentist’s details may help avoid unnecessary duplication where the images are suitable.

Discuss any new pain, dental work or change in health rather than deciding from the date alone. Ask whether a small image of one area answers the question or whether a wider view is needed. You should hear the reason in terms you understand and know the fee. If you decide against the recommended imaging, ask the dentist to explain the limits that places on diagnosis and planning before choosing the next step.

• Australian Dental Association. Dental X-rays

Ask why the image is needed and tell the dentist if you are pregnant or could be. Pregnancy does not automatically rule out a necessary dental X-ray; the ADA advises discussing the examination with your dentist (ADA, dental X-rays).

Radiation exposure varies by the type of dental image, so a single comparison cannot describe every scan (ARPANSA, dental imaging). Ask which examination is proposed, whether existing images can answer the question and how the benefit is weighed against exposure. You do not need to calculate radiation doses yourself to ask those questions.

If you are unsure, request an explanation before the image is taken. Mention a recent scan at another clinic and give the team permission to request the relevant records if needed. The decision should address your current dental problem, not an automatic schedule. Avoid assuming either that every image is essential or that postponing all imaging is the safer choice in every situation.

• Australian Dental Association. Dental X-rays
• ARPANSA. Dental imaging