Dental X-rays show what the eye cannot: decay between the teeth, infection at the root tip, bone levels, and the position of unerupted teeth. The dose from a dental X-ray is very small, and images are taken only when they will change what is done.
What they reveal
- Decay between teeth and under existing fillings.
- Infection or abscess at the root of a tooth.
- Bone loss from gum disease.
- The position of impacted teeth, especially wisdom teeth.
- Bone volume and anatomy before implant placement.
- Development of children's teeth, and whether they have room.
Without an image, much of this is guesswork until the problem is advanced.
Safety
Modern dental X-rays use digital sensors, which need far less radiation than older film. Exposure is limited to the small area being examined, protection is used, and the number of images is kept to what is clinically necessary.
How often?
There is no fixed schedule. Frequency depends on your risk of decay and gum disease, your age, your symptoms, and the treatment planned. Someone with a healthy mouth and no complaints needs images far less often than someone with active decay or gum disease.
CBCT scans
A 3D CBCT scan is used where flat images are not enough — implant planning, assessing impacted teeth, or investigating jaw structures. It gives a three-dimensional view of bone volume and anatomy, which is what makes precise implant placement possible.
When they are postponed
Always tell your dentist if you are pregnant or may be. Images are then taken only when necessary, with protection, and elective imaging is deferred.
Common questions
Can I refuse an X-ray? Yes, but the dentist may be unable to diagnose or treat safely without one, and will explain what cannot be assessed.
Do I need new images if I have recent ones? Often not. Ask your previous clinic to share them.
Are X-rays needed for children? Sometimes — to check for decay between teeth or how permanent teeth are developing, at intervals based on their risk.
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