How-to · Exam prep
Common dental charting abbreviations every new assistant should know
Your first week in a dental office, someone will say "tooth 30 needs an MOD, grab a BWX first" — and mean it as a complete sentence. Here's the shorthand offices chart with every day, in plain English, with a practice deck you can tap through until it sticks.
Why offices chart in shorthand
A busy practice sees patient after patient, and the chart is where everything lands: what the dentist found, what was done, what's planned. Writing "three-surface composite restoration on the mesial, occlusal, and distal surfaces of tooth thirty" twenty times a day isn't realistic — so the profession compressed it into shorthand. "MOD comp #30" says the same thing in seconds.
For a new assistant, that shorthand is a language barrier for exactly as long as you let it be. The good news: most of it is built from a small set of pieces, and once you know the pieces, unfamiliar combinations start decoding themselves.
Start with the five surfaces
Most charting shorthand is built on the surfaces of a tooth. Learn these five and abbreviations like MOD stop being mysterious letters and become a map:
M — Mesial: the side toward the front-center of the mouth. D — Distal: the side away from the center. O — Occlusal: the chewing surface of back teeth (front teeth use I — Incisal, the biting edge). B — Buccal: the cheek side of back teeth (front teeth: F — Facial or labial, the lip side). L — Lingual: the tongue side of any tooth.
String them together and you're reading real charting: a DO is a filling covering the distal and occlusal surfaces. An MOD covers mesial, occlusal, and distal. If you want the full walkthrough of tooth numbering and surfaces, start with how to chart teeth for beginners — this post picks up where it leaves off.
The practice deck: tap each card to reveal its meaning
These are grouped the way you'll meet them: procedures, imaging, and the everyday admin shorthand. Tap a card, guess first, then check yourself. The bar keeps score.
Treatment & procedures
X-rays & imaging
Everyday chart notes
Reading a real chart line
Put it together. A treatment plan might read: "BWX, prophy, FL — TX: MOD comp #30, DO amal #19." Translated: take bitewing X-rays, do a cleaning and fluoride treatment; the planned treatment is a three-surface composite on tooth 30 and a two-surface amalgam on tooth 19. What looked like alphabet soup a minute ago is a full clinical story.
Charting isn't just office shorthand — it's documentation that can be read back years later by another provider, an insurance company, or a board. Accuracy beats speed every time. If you didn't catch what the dentist called out, ask them to repeat it. Every good office would rather hear the question than find the error.
Every office has its own dialect
One practice writes "prophy," another writes "pro." Some chart composites as "comp," others use the shade or the material brand. Software matters too — the codes a paper chart used get replaced by dropdown menus in modern practice-management systems. So treat this list as the common core, not gospel. In your first week anywhere, ask two questions: "How do y'all chart this?" and "Can I see a few finished notes as examples?" Those two questions make you look professional, not green.
How to make them stick before your first job
Reading a list once won't do it — reps will. Run this deck a few times over a week, then drill the wider vocabulary with our free dental terms flashcards. When you're ready to practice charting itself, the interactive charting tool lets you mark surfaces on a real tooth chart, and our students go further in Practice Pro, which includes the same style of tooth chart and perio charting that real office software uses. In the classroom, charting callouts become muscle memory in our Skills Lab — one more reason hands-on training pays off in interviews.
And if a term trips you up on day one of class, that's normal. Keep the day-one cheat sheet handy and give yourself a week. This language is smaller than it looks.
Learn the language — then the career.
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Apply now →Keep reading: How to chart teeth for beginners · The flashcards tool walkthrough · Dental instruments 101