How Dentists Detect Cavities Early: Digital X-Rays and CariVu

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4 Nov 2026 Time - 6:14 pm

By the time a cavity causes pain, it has usually been growing for a while. That is why modern dental exams focus on finding decay early, when treatment is simpler and less invasive. Two tools that help are digital X-rays and DEXIS CariVu.

Why Early Detection Matters

Many early cavities form between teeth or under existing fillings, where they are hard to see during a visual exam. Catching decay early often means a small filling rather than a larger restoration, and it helps preserve more of your natural tooth.

Digital X-Rays

Digital dental X-rays let your dentist see what cannot be seen by looking: decay between teeth, problems beneath old fillings, bone levels around your teeth, and infection near the root. Compared with traditional film, digital X-rays use less radiation and produce images instantly that can be enlarged on screen.

What Is CariVu?

DEXIS CariVu is a handheld device that uses near-infrared light instead of radiation. Healthy enamel lets the light pass through, while decay and some cracks show up as darker areas. Because there is no radiation involved, it is a good option for patients who prefer to limit X-ray exposure, including children and pregnant patients.

Why Use Both?

The two tools complement each other. X-rays show bone levels and areas below the gumline. CariVu gives a close-up look at the tooth itself. When your dentist sees something suspicious on one, the other can help confirm it.

What This Means for You

• Fewer surprises at your appointments
• More conservative treatment when problems are caught early
• A quick, comfortable process during a routine exam

Signs You Should Not Wait For

Even with good technology, symptoms are worth acting on. See your dentist if you notice:

• Sensitivity to hot, cold, or sweet foods
• Dark spots or pits on a tooth
• Pain when biting down
• A rough or sticky spot you can feel with your tongue

You can also read our post on how to tell if you have a cavity.

Frequently Asked Questions

Is CariVu safe for children and pregnant patients?
CariVu uses light, not radiation, so it is considered safe for these groups. Your dentist can talk you through any concerns.

Does CariVu replace X-rays?
No. X-rays are still needed for things like bone health and areas below the gumline.

How often will I need X-rays?
It depends on your cavity risk, gum health, and dental history. Your dentist will recommend a schedule that fits you.

Does this make my appointment longer?
Not by much. Both are quick additions to a routine exam.

Book Your Next Exam

Early detection starts with a thorough exam. Call Iris Dental Group in Mississauga at 05-607-7721, or book online.