Check-up & scaling
Dental X-rays and 3D CT: how much radiation, and when you need one
Panoramic X-ray vs 3D CT explained: what each shows, typical radiation compared with daily life and flights, and when we take them.
By Dr. Kang Jun-guMedically reviewed by Dr. Kang Jun-guPublished Updated 4 min read
Quick answer
Dental X-rays use very low doses: a panoramic X-ray is roughly comparable to a few days of natural background radiation, and is in the same range as a long-haul flight. A 3D CT uses more but is still low, and is taken only when it changes the treatment, such as before an implant or to check a hidden infection. Tell us if you might be pregnant.
Panoramic X-ray
One image of all your teeth, both jaws and the joints. Useful for a general check, wisdom teeth and bone level. It takes about 15 seconds.
3D CT (cone beam)
A three-dimensional image used to measure bone, find nerves and sinuses, or locate infection that a flat X-ray can't show. We use it when it changes the decision, not routinely.
How we keep doses low
- Only the images we need
- Using recent X-rays you bring
- Thyroid collar where appropriate
- Modern low-dose equipment
Questions people also ask
Can I have a dental X-ray if I'm pregnant?
X-rays are usually postponed unless urgent. If one is essential, a lead apron and minimal images are used. Always tell the dentist.
Will the clinic give me copies of my X-rays?
Yes. Ask for digital copies to take to your home dentist.
Need this looked at in Seoul?
Check-ups, scaling and whitening, with fees shown before we start.
Dr. Kang is a board-certified Integrated Dentistry specialist trained at Yonsei, Harvard and Columbia. He treats every patient at the Gongdeok clinic himself.
About Dr. KangHow we write these guides: each guide is written from questions our patients ask, reviewed by Dr. Kang, and updated when guidance changes. It is general information, not a diagnosis. For advice about your own teeth, please book a check-up.
Related guides
Check-up & scaling
English-speaking dentist in Seoul: how to choose one you can trust
What to check before booking a dentist in Seoul as a foreigner: language, licensing, transparent fees, and red flags to avoid.
Check-up & scaling
Dental cleaning in Seoul without Korean insurance: what tourists should know
How scaling works for visitors who aren't on Korean National Health Insurance, what's included, and how to get receipts for your insurer at home.
Check-up & scaling
What happens at a dental check-up and scaling in Korea
A step-by-step look at a check-up and scaling visit for travellers: timing, X-rays, what scaling feels like, and what to expect afterwards.