Dental X-rays help dentists see areas that cannot be properly checked by looking in the mouth alone, including the spaces between teeth, tooth roots, supporting bone, developing teeth, and areas under existing fillings or crowns.
For patients in Greystanes and across Western Sydney, X-rays are not taken as a routine extra for no reason. They are recommended when the information may help diagnose a problem, monitor a change, or plan treatment more accurately.
Why Dentists Recommend X-Rays
Some dental problems develop quietly before they cause pain. X-rays may help identify decay between teeth, infection around a root, bone loss from gum disease, impacted teeth, damage below the surface, and changes around existing dental work.
They are also important for treatment planning. If a patient needs a root canal, crown, implant assessment, extraction, orthodontic advice, or wisdom tooth review, imaging helps the dentist understand the anatomy before making recommendations.
Common Types of Dental X-Rays
Bitewing X-rays are small images used to check between the back teeth, where decay can hide even when the biting surface looks normal. They can also show bone height between teeth.
Periapical X-rays, also called PA X-rays, show the whole tooth from the crown to the root tip and the surrounding bone. They are helpful when a tooth is painful, heavily filled, has had trauma, or needs assessment for infection.
Panoramic X-rays, sometimes called OPGs, show a broad view of the jaws, teeth, jaw joints, sinuses, and developing or impacted teeth. They are commonly used for wisdom tooth assessment, orthodontic screening, and broader treatment planning.
Lateral cephalometric X-rays, often called lateral cephs, show a side-view image of the head, jaws, teeth, and facial profile. They are commonly used in orthodontic assessment because they show jaw relationship, tooth position, facial growth, and bite pattern. The benefit is a clearer orthodontic diagnosis and a more accurate plan for braces, clear aligners, growth monitoring, or jaw-related concerns.
CBCT scans, or cone beam CT scans, create a three-dimensional image of the teeth, jaws, nerves, sinuses, and surrounding bone. CBCT is not needed for every concern, but it can be useful when two-dimensional X-rays do not provide enough detail, such as for implant planning, complex wisdom teeth, root canal complications, jaw pathology, trauma, or checking nerve position before treatment.
Radiation Dose in Everyday Terms
It is reasonable to ask about safety. Dental X-rays involve radiation, but modern dental imaging uses low doses, and imaging is recommended only when the expected benefit outweighs the risk.
A helpful way to understand dose is to compare it with natural background radiation, which we all receive from everyday sources such as the ground, air, food, and cosmic radiation. The figures below use a rounded comparison of about 3 mSv of natural background radiation per year, or about 8 microsieverts per day. They are approximate only, because actual dose depends on the machine, settings, image size, and the patient’s anatomy. The CBCT examples use published low-dose figures for the Soredex Cranex 3Dx.
| Imaging type | Approximate equivalent background radiation | How to think about it |
|---|---|---|
| Bitewing X-rays | About 4-6 hours for four bitewings | Commonly used to find decay between back teeth and check bone levels. A smaller set of two bitewings is usually less again. |
| Periapical X-ray / PA | About 4-6 hours | A small targeted image for a painful tooth, infection check, trauma, or root assessment. |
| Panoramic X-ray / OPG | About 1-3 days | A broad overview of the jaws, wisdom teeth, sinuses, and developing teeth. |
| Lateral ceph | Usually less than 1 day | A side-view orthodontic image used to assess jaw relationship, facial profile, and bite planning. |
| Cranex 3Dx CBCT 5 x 5 cm | About 12-15 hours | A focused three-dimensional scan of a small area, such as one tooth, a root canal concern, or a very localised surgical question. |
| Cranex 3Dx CBCT 6 x 8 cm | About 1-2 days | A three-dimensional scan of a larger jaw area, often used for implant planning, selected wisdom tooth assessment, or several adjacent teeth. |
| Cranex 3Dx CBCT 8 x 8 cm | About 2 days | A broader three-dimensional scan used when a wider area of the jaws or complete dentition needs to be assessed. |
| Cranex 3Dx CBCT 8 x 15 cm | About 3 days | An optional larger field used when a wider area of the jaws, airway, sinuses, or multiple structures needs to be assessed. |
| Chest X-ray | About 2-3 days | A common medical comparison. A standard chest X-ray is often higher than small dental X-rays, but usually lower than many CBCT scans. |
| Limb or joint X-ray | About 1 week | Used for areas such as an arm, leg, hand, foot, shoulder, or knee when injury or bone change needs assessment. |
| Mammogram | About 2 weeks | A routine breast screening comparison. The dose is still considered low, but it is higher than most standard two-dimensional dental X-rays. |
The key point is that different images have different doses and different purposes. A bitewing X-ray is not the same as a 3D CBCT scan, and a small-field CBCT is not the same as a large-field CBCT. CBCT imaging is recommended only when the extra three-dimensional information is expected to help answer a clinical question.
How Often Are X-Rays Needed?
There is no single schedule that suits every person. A patient with frequent decay, dry mouth, gum disease, many fillings, orthodontic treatment, or dental pain may need imaging more often than someone with low disease risk and stable oral health.
For many patients, X-rays are not taken at every appointment. They are recommended when there is a clinical reason, such as checking between teeth, investigating pain, monitoring growth, or planning treatment.
What Happens During a Dental X-Ray?
Most dental X-rays are quick and painless. For small images, you may be asked to bite gently on a holder while the image is taken. For a panoramic X-ray or lateral ceph, you stand or sit still while the machine is positioned around your head. For a CBCT scan, the machine rotates around you to create a three-dimensional image.
If you have a small mouth, strong gag reflex, dental anxiety, or difficulty with sensors, mention it. There are often ways to adjust positioning, take breaks, or choose an approach that makes the process easier.
The Bottom Line
Dental X-rays help detect problems earlier, guide treatment planning, and support long-term oral health. The goal is not to take more X-rays than necessary. The goal is to use the right image at the right time so dental care can be accurate, preventive, and patient-focused.
If an X-ray is recommended, it is appropriate to ask what the dentist is checking for, whether the image may change the treatment plan, and whether previous X-rays can be compared.