Caries detection devices are marketed as a way to find decay earlier, avoid unnecessary radiographs between scheduled images, and show patients what the dentist is seeing. The category includes pen-style laser fluorescence devices, cameras that use violet light to make bacterial byproducts fluoresce, near-infrared transillumination cameras, and intraoral scanners with built-in near-infrared imaging. Each works differently, produces different kinds of false positives and false negatives, and fits into the workflow differently.
This guide describes the technologies and example products factually, summarizes what systematic reviews have found in general terms, and covers daily use, maintenance, troubleshooting, compliance and buying. It is equipment education, not clinical guidance. These devices are adjuncts. Diagnosis rests on the clinician's examination, radiographs as indicated, history and judgment.
Key takeaways
- The main technologies are laser fluorescence (a numeric reading), camera-based fluorescence (color-coded images), near-infrared transillumination (grayscale images that show lesions as dark areas), and electrical conductance.
- A 2020 Cochrane review of fluorescence devices found wide variation in performance and rated the certainty of evidence as low. At a median specificity of 0.78, estimated sensitivity was 0.70.
- An analysis of the Cochrane enamel caries reviews concluded that visual and visual-tactile examination remain the mainstay and that the broad prediction intervals make it hard to predict how devices will perform in everyday practice.
- FDA classifies laser fluorescence caries detection devices as Class II, prescription-use devices that require sterilizing the handpiece before each use.
- Stains, calculus, sealants, composites and plaque can affect fluorescence readings. Clean, dry teeth and a consistent protocol matter.
- For used purchases, software compatibility, calibration accessories and tip availability matter more than cosmetic condition.
What these devices do and how they work
Carious tooth structure differs from sound tooth structure in ways light can reveal. Demineralized enamel scatters and absorbs light differently, and bacteria in lesions produce compounds (such as porphyrins) that fluoresce when excited by certain wavelengths. Devices exploit one or more of these differences.
Laser fluorescence (numeric)
A pen-shaped device shines red laser light into the tooth through a probe tip and measures returning fluorescence. The device displays a number; higher numbers indicate more fluorescence, which the manufacturer associates with more extensive decay. KaVo's DIAGNOdent pen is the best-known example. KaVo lists probes for fissures, proximal surfaces and periodontal calculus, and publishes reading bands for each (for fissures, for example, 0 to 12, 13 to 24, and over 25, which it associates with increasingly intensive management). The FDA's regulation for this device type, 21 CFR 872.1745, describes a laser, a fluorescence detector in a handpiece and a console that performs device calibration.
Camera-based fluorescence (color maps)
Cameras use violet or blue LEDs to excite fluorescence and display a color-coded image. Air Techniques describes its CamX Spectra as using four violet LEDs that cause metabolic byproducts of cariogenic bacteria to fluoresce, displaying healthy enamel as green and carious areas in red and other colors, with a numerical indicator from 0 to 5. Acteon's SoproCare camera offers fluorescence-based modes as well. Dürr Dental's VistaCam iX system uses interchangeable camera heads; FDA cleared its "Proof" head, which uses violet LEDs and a color-coded image, as an aid in caries detection, with Air Techniques listed as the US contact on the 510(k). Earlier devices such as Carestream's CS 1600, cleared by FDA in 2011, combined fluorescence and reflectance imaging in an intraoral camera and still appear on the used market.
Near-infrared transillumination (images)
Near-infrared (NIR) light passes through enamel, which is relatively transparent at those wavelengths, while demineralized areas scatter and absorb it. A device shines NIR light through the tooth and captures an image. DEXIS's CariVu uses flexible arms that straddle the tooth; lesions appear as dark areas on a lighter tooth image, and the images integrate with DEXIS software. Published in vitro studies have evaluated 780 nm NIR transillumination for this device type.
Near-infrared imaging in intraoral scanners
Some intraoral scanners capture NIR images during scanning. Align Technology's iTero Element 5D, which received FDA 510(k) clearance, uses near-infrared imaging (NIRI) intended to aid detection of interproximal lesions above the gingiva. For practices already scanning most patients, this adds imaging with little extra chair time. See the intraoral scanner guide.
Electrical conductance or impedance
These devices measure how easily a small current passes through tooth structure, which changes with demineralization. They are less common in US offices, and Cochrane has reviewed the evidence separately.
Parts you should know
- Handpiece or pen with the light source and detector.
- Tips or probes for specific surfaces, often sterilizable and consumable over time.
- Calibration reference or routine, where the device uses one.
- Camera head, cable or dock for image-based systems.
- Software or driver to display and store images or readings in the patient record.
Which type does your practice need?
| Technology | Output | Surfaces typically targeted | Workflow notes |
|---|---|---|---|
| Laser fluorescence pen | Number | Occlusal fissures, some proximal with specific tips | Portable, fast, no computer required; readings need recording by hand or software |
| Violet or blue fluorescence camera | Color-coded image, sometimes a score | Occlusal and smooth surfaces | Doubles as documentation and patient education; needs software |
| NIR transillumination camera | Grayscale image | Proximal and occlusal; also shows some cracks | No ionizing radiation; image interpretation takes training |
| NIR in intraoral scanner | Images registered to the 3D scan | Interproximal above the gingiva | Efficient if you scan routinely; tied to scanner platform |
| Electrical conductance | Number | Occlusal | Uncommon in US offices |
Decision guide
- Prevention-focused and pediatric practices: a device that produces images helps with monitoring and patient education over time. Standardize how images are captured so they can be compared.
- Practices already buying an intraoral scanner: compare scanners with NIR imaging before buying a separate device.
- Hygiene-driven workflows: hygienists often run these devices. Confirm your state allows the use you have in mind and write the protocol down.
- Budget-limited practices: sharp clinical examination and appropriately prescribed radiographs matter more than any adjunct. Buy a device only when there is a clear protocol for what a positive or negative result changes.
- Space and utilities: minimal. Plan for the software install on each operatory computer and a charging spot for pens.
What the evidence says
Evidence on caries detection devices is extensive but uneven. In general terms:
- Fluorescence devices. A 2020 Cochrane systematic review (Macey and colleagues) included 133 studies, with 79 contributing to meta-analysis covering 21,283 tooth surfaces. At a median specificity of 0.78, the estimated sensitivity was 0.70. The reviewers found considerable variation between devices that they could not fully explain, and rated the overall certainty of the evidence as low. They illustrated the result with a hypothetical group of 1,000 surfaces at 57% prevalence: about 171 lesions would be missed and 95 sound surfaces would be flagged.
- Transillumination and optical coherence tomography. A 2021 Cochrane review examined these technologies for enamel caries. An overview of the series reported moderate sensitivity and specificity for this group, again with low certainty.
- Across technologies. A 2022 analysis of the Cochrane enamel caries reviews (Walsh and colleagues, Journal of Dental Research) concluded that the devices may add certainty to decisions, but that the broad prediction intervals make their real-world accuracy hard to predict, and that visual and visual-tactile examination remain the mainstay.
The business implication: a device can support monitoring and communication, but it should not be sold to patients, or used internally, as a replacement for examination and indicated radiographs. False positives can lead to unnecessary treatment; false negatives can create false reassurance. Write a protocol that states what the device result changes and what it does not.
Treat manufacturer accuracy claims carefully. Marketing materials often cite a single detection rate from one study or one lesion type. Ask which study, what population, what lesion depth, and whether the result was in extracted teeth or real patients.
How to use them: daily operation
Generic steps; follow the IFU for your device.
Start of day
- Charge pens or confirm battery level; confirm cameras are recognized by the operatory computer.
- Run the device's calibration routine if it has one, using the reference supplied by the manufacturer.
- Check that sterile tips or probes are available for each patient.
Per patient
- Open the correct patient chart before capturing any images or readings.
- Follow the IFU on tooth preparation. Plaque, stain, calculus and moisture affect fluorescence; many protocols call for cleaned, dried surfaces.
- For pen devices, many protocols take a baseline reading on sound tooth structure before measuring suspect sites, as the IFU describes.
- Capture or record results in a consistent position and format so later visits can be compared.
- Record the result in the chart with the tooth, surface and device used.
Between patients and end of day
- Send sterilizable tips for processing; discard single-use items.
- Clean and disinfect the handpiece or camera body per IFU; use barrier sleeves where the manufacturer recommends them.
- Charge or dock devices; close software properly.
Maintenance schedule
| Task | Frequency | Who | Notes |
|---|---|---|---|
| Sterilize tips or handpiece components | Before each patient use | Sterilization staff | FDA's regulation for laser fluorescence devices requires labeling that directs sterilizing the handpiece before each use |
| Clean and disinfect device body | Between patients | Assistant or hygienist | Approved disinfectants only |
| Calibration check | Daily or per IFU | Assistant or hygienist | Use the supplied reference; log it |
| Inspect tips and optics for scratches | Weekly | Lead assistant | Damaged tips give inconsistent readings |
| Battery or charger check | Monthly | Office manager | Replace batteries with genuine parts |
| Software and driver updates | As released, tested first | IT or vendor | Test on one operatory first |
| Protocol and training review | Annually | Dentist and hygiene lead | Confirm everyone uses the same technique and records results the same way |
| Repairs | As needed | Manufacturer or authorized service | Do not open laser or LED handpieces |
Troubleshooting
| Symptom | Likely causes | What to try | When to call a technician |
|---|---|---|---|
| Readings high on teeth that look sound | Stain, calculus, plaque, sealant or composite, prophy paste residue | Clean and dry per IFU, retake baseline, compare with exam | If high readings appear on a calibration reference |
| Readings drift during a session | Low battery, calibration drift, tip contamination | Recalibrate, swap tip, charge battery | If drift persists after recalibration |
| Calibration fails | Dirty or damaged tip, wrong reference, damaged optics | Clean or replace tip; use the correct reference | If calibration fails with a new tip |
| Fluorescence image all one color | Wrong mode, ambient light, settings | Check mode, reduce ambient light as IFU suggests | If modes will not change |
| NIR image too dark or washed out | Positioning, tip contact, exposure settings | Reposition per IFU, check settings | If the light source appears weak or dead |
| Camera not recognized | Driver, USB port, software selection | Reinstall driver, try another port, select device in software | If not recognized on any computer |
| Results not saving to chart | Bridge or integration settings, wrong chart open | Check integration settings; open chart first | Vendor support for bridge configuration |
| No power | Battery, charger, contacts | Charge, clean contacts, try spare battery | If a new genuine battery does not help |
Safety and compliance
- FDA. Laser fluorescence caries detection devices are Class II and prescription-use under 21 CFR 872.1745, with special controls including labeling on sterilizing the handpiece before each use. Other caries detection cameras and scanners reach the market through their own 510(k) clearances. Use the device within its cleared indications.
- Infection control. Items that contact mucous membranes are semicritical. The CDC calls for heat sterilization when possible, and for heat-sensitive items, an FDA-cleared barrier plus cleaning and disinfection with an EPA-registered hospital disinfectant per the manufacturer.
- Eye safety. Laser fluorescence pens use low-power lasers; follow the labeling and avoid pointing the beam at eyes.
- Documentation. Record readings and images in the chart, including which device was used. If device results support a treatment recommendation, the record should also show the clinical findings. See the compliance chapter.
- Insurance and billing. Coding for caries risk assessment and adjunctive procedures changes; check current CDT codes and payer policies before building fees around a device.
- State rules. Whether hygienists or assistants may use a particular device varies by state. Check your state board.
Buying new vs. used
These devices show up in practice sales and liquidations because many offices bought them, used them for a while, then stopped when no protocol stuck. That makes used units plentiful and cheap. The risk is buying a device whose software, tips or calibration accessories are no longer available.
Used caries detection device checklist
- Model identified; manufacturer still supports it with tips, batteries and software
- Calibration reference or routine included and passes
- All probes or tips included, undamaged, and sterilizable per IFU
- Camera-based units: driver works on your operating system; images save into your software
- Battery and charger included and working
- Readings or images consistent on repeat measurements of the same tooth
- Any software license transfers to you
- IFU downloaded from the manufacturer
- FDA clearance status known for the model
Red flags. Missing calibration accessories. A camera that only works with an old operating system or a discontinued imaging program. Tips no longer sold. A seller promoting a device as a way to "sell more fillings." Imports with no FDA clearance information.
Rough price ranges
Rough ranges that vary by model, condition, region and year. As one reference, a US dealer listed the KaVo DIAGNOdent pen at about $3,100 in 2026.
| Type | New (rough) | Used (rough) |
|---|---|---|
| Laser fluorescence pen | Roughly $2,500 to $3,500 | Often $500 to $1,500 |
| Fluorescence camera | Roughly $2,000 to $5,000 | Often $300 to $1,500 |
| NIR transillumination device | Several thousand dollars | Varies widely; confirm software support |
| Scanner with NIR imaging | Priced as an intraoral scanner | See the used scanner market guide |
Lifespan: software support usually determines useful life. Budget for tips and batteries along the way.
Brands and models you will see
Examples include:
- KaVo: DIAGNOdent pen (model 2190), laser fluorescence with fissure, proximal and perio probes.
- DEXIS: CariVu near-infrared transillumination device.
- Air Techniques: CamX Spectra caries detection aid (violet LED fluorescence).
- Dürr Dental: VistaCam iX with interchangeable heads, including the fluorescence "Proof" head.
- Acteon: SoproCare fluorescence camera.
- Align Technology: iTero Element 5D intraoral scanner with near-infrared imaging.
- Carestream Dental: the earlier CS 1600 fluorescence camera on the used market.
Related guides
Caries detection devices overlap with cameras, scanners and radiography. These pages help place them in your technology plan:
- Intraoral cameras
- Intraoral scanners and the used scanner market
- Digital dental sensors
- Hygiene department profitability
- Case presentation and treatment acceptance
Always follow the manufacturer's instructions for use (IFU) for your specific model. Repairs involving electrical, pressure vessel, radiation, or gas line work belong with a qualified technician. Infection control and radiation rules vary by state. Prices are rough ranges that vary by model, condition, region, and year. ChairsideSource is not affiliated with any manufacturer named here.