About ToothShader
A clinical tool for dental professionals — match teeth to shade-guide tabs with scientific color accuracy.
What is this tool?
ToothShader is a web-based application that uses CIEDE2000 color difference calculations to objectively match a tooth's color to standard shade guide tabs. By analyzing photos of the tooth and reference tabs under the same lighting conditions, it provides:
- ΔE00 scores — the scientific standard for perceptible color differences
- Similarity percentages — intuitive "how close is this?" feedback
- Directional guidance — if the match isn't perfect, it tells you which way to adjust (higher/lower Value, more/less Chroma, hue direction)
- 3-zone shade mapping — cervical, middle, and incisal thirds analyzed separately, like a dentist's shade prescription
Who is it for?
🦷 Dentists
Document shade matches objectively, communicate with labs quantitatively, and educate patients with visual similarity scores.
🔬 Dental Technicians
Understand exactly what a clinician means by "between A2 and A3" — receive numerical targets you can hit in the lab.
📚 Dental Students
Train your eye to recognize shade differences — the tool validates your selections and teaches the color science behind them.
Understanding the Results
ΔE00 Score
The ΔE00 value is the scientific standard for color difference:
- ≤ 0.8: Imperceptible — essentially a perfect match
- ≤ 1.8: Clinically acceptable — most patients won't notice a difference
- ≥ 3.5: Clearly mismatched — patients will see this as different
Similarity %
This converts ΔE00 to an intuitive 0–100 scale. 100% = perfect match (ΔE00 = 0). 93% ≈ clinically acceptable threshold (ΔE00 = 1.8).
3-Zone Shade Mapping
For comprehensive documentation, the tool can analyze the cervical, middle, and incisal thirds separately:
- Cervical: Near the gum — typically more opaque and chromatic
- Middle (body): The main shade — this drives your tab selection
- Incisal: The biting edge — translucent and lighter; match is approximate
The middle third is your reference for the shade guide. Cervical and incisal readings help the lab understand translucency and characterization.
Privacy & Data
This tool runs entirely in your browser. No photos, measurements, or personal data are sent to any server. Everything stays local to your device.
Disclaimer
This tool is intended as an adjunct to clinical judgment, not a replacement. Shade matching involves factors beyond color alone — translucency, fluorescence, surface texture, and metamerism all play a role in how a restoration appears in the mouth. Always verify shade matches visually under multiple lighting conditions.