Interactive Tooth Numbering Chart & Dental Charting Practice Lab
Learn the U.S. Universal system from 1–32 and A–T, connect it to FDI/ISO tooth designations, practice tooth surfaces, and decode basic chart shorthand such as #19 MOD.
Selected tooth
Select a tooth above.
Surface trainer
Choose a tooth first. The pad reorients mesial/distal and facial/lingual to match that tooth's location.
Practice score
See how these skills fit into dental assistant training or compare the path with dental hygiene programs.
Chart shorthand decoder
Enter a Universal tooth identifier with optional ADA surface letters. Examples: #19 MOD, 8 MI, K O.
Universal ↔ FDI converter
Convert a Universal number/letter or a two-digit FDI designation using the ADA mapping.
Tooth numbering quick reference
The American Dental Association says the Universal/National Tooth Designation System is the most commonly used tooth-numbering system among U.S. dental professionals. Permanent teeth run from #1, the maxillary right third molar, around the arches to #32, the mandibular right third molar. Primary teeth use A through T. The ADA also publishes ISO 3950 mappings for each tooth.
This trainer displays the arches as if you are facing the patient, so patient right appears on your left. That orientation choice is stated directly in the tool so you do not have to mentally guess which "right" a diagram means.
Permanent teeth 1-32 with FDI mapping
| Universal | Tooth | FDI |
|---|---|---|
| 1 | Maxillary right third molar | 18 |
| 2 | Maxillary right second molar | 17 |
| 3 | Maxillary right first molar | 16 |
| 4 | Maxillary right second premolar | 15 |
| 5 | Maxillary right first premolar | 14 |
| 6 | Maxillary right canine | 13 |
| 7 | Maxillary right lateral incisor | 12 |
| 8 | Maxillary right central incisor | 11 |
| 9 | Maxillary left central incisor | 21 |
| 10 | Maxillary left lateral incisor | 22 |
| 11 | Maxillary left canine | 23 |
| 12 | Maxillary left first premolar | 24 |
| 13 | Maxillary left second premolar | 25 |
| 14 | Maxillary left first molar | 26 |
| 15 | Maxillary left second molar | 27 |
| 16 | Maxillary left third molar | 28 |
| 17 | Mandibular left third molar | 38 |
| 18 | Mandibular left second molar | 37 |
| 19 | Mandibular left first molar | 36 |
| 20 | Mandibular left second premolar | 35 |
| 21 | Mandibular left first premolar | 34 |
| 22 | Mandibular left canine | 33 |
| 23 | Mandibular left lateral incisor | 32 |
| 24 | Mandibular left central incisor | 31 |
| 25 | Mandibular right central incisor | 41 |
| 26 | Mandibular right lateral incisor | 42 |
| 27 | Mandibular right canine | 43 |
| 28 | Mandibular right first premolar | 44 |
| 29 | Mandibular right second premolar | 45 |
| 30 | Mandibular right first molar | 46 |
| 31 | Mandibular right second molar | 47 |
| 32 | Mandibular right third molar | 48 |
Primary teeth A-T with FDI mapping
| Universal | Tooth | FDI |
|---|---|---|
| A | Primary maxillary right second molar | 55 |
| B | Primary maxillary right first molar | 54 |
| C | Primary maxillary right canine | 53 |
| D | Primary maxillary right lateral incisor | 52 |
| E | Primary maxillary right central incisor | 51 |
| F | Primary maxillary left central incisor | 61 |
| G | Primary maxillary left lateral incisor | 62 |
| H | Primary maxillary left canine | 63 |
| I | Primary maxillary left first molar | 64 |
| J | Primary maxillary left second molar | 65 |
| K | Primary mandibular left second molar | 75 |
| L | Primary mandibular left first molar | 74 |
| M | Primary mandibular left canine | 73 |
| N | Primary mandibular left lateral incisor | 72 |
| O | Primary mandibular left central incisor | 71 |
| P | Primary mandibular right central incisor | 81 |
| Q | Primary mandibular right lateral incisor | 82 |
| R | Primary mandibular right canine | 83 |
| S | Primary mandibular right first molar | 84 |
| T | Primary mandibular right second molar | 85 |
Tooth surfaces without the directional brain melt
A tooth surface name describes where that surface sits relative to the midline, lips, cheeks, tongue, or chewing edge. The hard part is that mesial and distal flip visually across the midline. That is why the surface pad above reorients itself instead of teaching a single flat diagram that only works for one quadrant.
| Code | Surface | What it means | Where used in this trainer |
|---|---|---|---|
| M | Mesial | Toward the facial midline | All teeth |
| D | Distal | Away from the facial midline | All teeth |
| F | Facial / labial | Toward the lips or face | Anterior teeth |
| B | Buccal | Toward the cheek | Posterior teeth |
| L | Lingual | Toward the tongue | All teeth |
| I | Incisal | Biting edge of an anterior tooth | Anterior teeth |
| O | Occlusal | Chewing surface of a posterior tooth | Posterior teeth |
The ADA Dental Claim Form uses the single-letter surface codes B, D, F, I, L, M, and O. In multiple-surface entries, the letters are written together without spaces. This tool deliberately rejects impossible combinations, such as an occlusal surface on an incisor.
What this dental charting practice does, and what it intentionally does not do
CODA's current Dental Assisting Accreditation Standards make tooth anatomy and tooth numbering foundational content before patient-contact activities. The same standards separately require laboratory/preclinical competence in assisting with or performing dental charting. That makes a visual recall tool useful, but it does not make a browser exercise clinical software.
DANB's current AMP exam outline places 60 percent of the exam in tooth anatomy, morphology, and physiology and explicitly includes tooth-numbering systems such as Universal and Palmer. The GC outline separately covers tooth surfaces, charting oral-cavity conditions, and treatment documentation.
Good uses for this tool
- Memorizing 1-32 and A-T
- Learning tooth names and quadrants
- Practicing mesial vs. distal orientation
- Recognizing anterior vs. posterior surface codes
- Converting ADA-published Universal and FDI mappings
- Building speed with synthetic practice prompts
Not what this tool is for
- Entering real patient information
- Diagnosing dental conditions
- Choosing procedures or treatment plans
- Replacing your instructor, externship, or state rules
- Teaching office-specific color or symbol conventions as universal
- Claiming certification readiness from a practice score
Chart colors and graphical symbols vary across schools, offices, and practice-management systems. Rather than teaching one configurable convention as gospel, this lab stays focused on the more portable foundation: tooth identity, location, surface terminology, and standardized reporting letters.
Where these skills fit in dental training
If the numbering and charting side of dentistry clicks for you, dental assisting is the most direct career connection. Dental assistants commonly learn chairside procedures, patient records, dental materials, infection control, radiography, and charting as part of their training. Requirements and allowable duties still vary by state, so the right program should line up with the rules where you expect to work.
Training options, accreditation, state-fit questions, and schools.
Compare the longer, licensed preventive-care path.
Compare training, responsibilities, pay, and career fit.
Tooth numbering and dental charting FAQ
What tooth numbering system is most commonly used in the United States?
The ADA says the Universal/National Tooth Designation System is the most commonly used system among U.S. dental professionals. Permanent teeth are numbered 1 through 32 and primary teeth are lettered A through T.
What is FDI tooth numbering?
ISO 3950 uses a two-digit designation system for teeth. The ADA's Universal Tooth Designation System value set publishes an ISO mapping for each permanent and primary tooth. The converter above uses those ADA mappings rather than guessing from a third-party chart.
What is Palmer notation?
Palmer notation identifies a tooth by its position from the midline plus a quadrant marker. DANB's current AMP exam outline explicitly includes Universal and Palmer numbering systems. Because digital Palmer glyphs can render inconsistently, this page shows a visual Palmer-style quadrant mark plus a plain-text fallback such as UR 6.
What do M, D, B, F, I, L, and O mean?
They are the tooth-surface codes used by the ADA Dental Claim Form: mesial, distal, buccal, facial/labial, incisal, lingual, and occlusal. The trainer uses F for the outer surface of anterior teeth and B for posterior teeth, while I is reserved for anterior teeth and O for posterior teeth.
Why does patient right appear on the left side of this chart?
This tool uses a face-to-face dental-chart view. Labels above the odontogram state that orientation explicitly so the learner can distinguish the patient's anatomical right and left from the viewer's screen right and left.
Can I use this instead of clinical charting software?
No. This is a study tool. It does not collect patient data, diagnose conditions, choose treatment, or reproduce a specific practice-management system.
Sources and methodology
We built the tooth mappings and surface-code rules from current authoritative sources, then limited the simulator to claims those sources actually support.
- American Dental Association: Universal Tooth Designation System Value Set, July 2024
- American Dental Association: 2024 Dental Claim Form Completion Instructions
- Commission on Dental Accreditation: Dental Assisting Education Program Standards
- Dental Assisting National Board: AMP Exam Outline and References
- Dental Assisting National Board: General Chairside Assisting Exam Outline
- ISO 3950:2016, Dentistry - Designation system for teeth and areas of the oral cavity
- Dentalcare continuing education: Surfaces of the Teeth
Verification note: reviewed September 28, 2026. ISO lists ISO 3950:2016 as the published edition while a fifth edition is under development.