Sixmonth

Install

dental-explainer follows the open Agent Skills format. The skill lives in skills/dental-explainer/, a folder with a SKILL.md at its root, and the repo doubles as a plugin marketplace for Claude, ChatGPT and Codex.

Claude (web & desktop app): no download needed

1. Open Customize → Plugins → Add marketplace.
2. Paste sixmonth-ai/dental-explainer.
3. Find Dental Explainer and click Install.

It updates automatically when the repo changes. For screenshots and page assembly, turn on code execution in Settings → Capabilities.

Where	How
Claude Code	/plugin marketplace add sixmonth-ai/dental-explainer, then /plugin install dental-explainer@sixmonth
Codex, ChatGPT desktop app	codex plugin marketplace add sixmonth-ai/dental-explainer, then codex plugin add dental-explainer@sixmonth. In the ChatGPT desktop app, restart it and install Dental Explainer from the Sixmonth source in the Plugins Directory.
Cursor, OpenCode, Copilot, Gemini CLI	npx skills add sixmonth-ai/dental-explainer
ChatGPT on the web (plans with Skills), or Claude by ZIP	Download dental-explainer.zip and upload it as is (don't unzip it). ChatGPT: Skills → Create → Upload from your computer. Claude: Settings → Capabilities → Skills → Upload a skill.
Manual	git clone https://github.com/sixmonth-ai/dental-explainer.git && cp -r dental-explainer/skills/dental-explainer ~/.claude/skills/

What it runs and fetches. Figures load three.js r128 from cdnjs.cloudflare.com, and each figure's footer links to sixmonth.ai. The optional scripts (Python, headless Chromium) run locally, and only when the agent has code execution. The skill sends no data anywhere.

Then ask for a dental visual in plain words. The agent asks which format you want (image or interactive) unless you say, and asks what to show only when the request is vague. You can also call it by name: /dental-explainer in Claude, $dental-explainer in Codex.

Show an exploded view of an implant replacing 36
Why does MB2 get missed in upper first molars? Cut through the tooth
Healthy lower molar vs periodontitis, with furcation involvement
Root-filled premolar with fibre post, core and crown, for patients
How does a cavity reach the nerve? For a patient, as an image
Class II composite on 15, step by step
Working vs non-working condyle when the jaw moves to the right
Mixed dentition of an 8-year-old, lower left

What it covers. Permanent and primary teeth (every FDI position, real third molars, impactions), numbering charts (FDI, Universal, Palmer) and arches, tooth anatomy in section, implants, crown preparations, bridges, veneers, inlays and onlays, posts and cores, caries, cavity preparations and fillings placed and cured in increments, periodontal disease and probing, root canal treatment and endodontic instruments, braces, aligners and tooth movement, and jaw movement with the TMJ (upper and lower jaws, condyles, articular disc, eminence, Bennett movement).

Works on every screen. Interactive pages run in Claude on the web, desktop and mobile apps, and in any browser, including iPhone and Safari. Burs and drills spin and throw chips while they cut, so procedures read as they happen.

Gallery

Every figure below was made by the skill, shown here in image mode. The same script also opens as an interactive page; the sources and pages are in examples/.

Why it exists

AI models are fluent about dentistry and often wrong about it. dental-explainer gives the agent a verified facts file to work from, plus a checklist it runs before every figure.

Models often…	The skill knows
say adults have 28 teeth	32 permanent teeth including third molars; 20 primary teeth, no primary premolars
treat FDI 36 and Universal 36 as the same tooth	FDI 36 = Universal 19, and Universal stops at 32
draw every molar with three roots	maxillary molars have 3 roots, mandibular molars 2
give the upper first molar three canals	MB2 is present in about 57–74% of upper first molars
say enamel grows back	enamel is acellular; only early lesions remineralise
quote one torque for all implants	torque is manufacturer-specific
swap the working and non-working sides	the working side is the side the jaw moves toward: that condyle pivots, the other travels forward, down and medially

Values carry their sources. Anything not yet checked against a source is tagged [U].

How it works

1. Ask. Image or interactive? If the request is vague, what should it show (for a procedure, it proposes the steps first).
2. Teaching point. The agent pins down the one idea the figure must show.
3. Facts. It looks up the numbers in the facts file instead of guessing.
4. Plan. Parts with real sizes in millimetres, the cut planes, and a short story of camera moves that ends on the shot that answers the question. Every piece of text has to earn its place. Procedures (placing an implant, shaping a canal) become named clinical steps: a stepper on the page or a numbered storyboard image.
5. Build. A short script against the bundled three.js drawing kit, with ready-made teeth for every FDI position (primary teeth too), implants, crowns, bridges, veneers, fillings, posts, endodontic files, brackets, aligners, bone, gingiva and periodontal defects, burs, drills and curing lights, and upper and lower jaws with the TMJ and articular disc.
6. Verify and deliver. Where a browser is available, it renders the PNG (or screenshots the page on desktop, phone and an emulated iPhone), looks at it, and fixes what's wrong. Where there is none (Claude on the web), it walks through a stricter checklist instead. On a topic the kit has no model for, it says up front that the figure will be a schematic.

dental-explainer/
├── .claude-plugin/
│   ├── plugin.json              plugin manifest
│   └── marketplace.json         lets Claude add this repo as a marketplace
└── skills/dental-explainer/
    ├── SKILL.md                 the workflow the agent follows
    ├── references/
    │   ├── dental-facts.md      verified values and sources: the correction layer
    │   ├── kit-api.md           drawing-kit reference
    │   └── topics/              one guide per topic: perio, endo, caries, prosthetics, ortho, primary teeth and arches, jaw and TMJ
    ├── assets/dentkit.js        3D kit (loads three.js r128 from cdnjs)
    ├── examples/                finished figures across every topic, .js source and .html pages
    └── scripts/                 build.py (assemble a page) · render.py (PNG, GPU when available) · check.py (screenshots incl. iPhone, error and stretch check)

Limits

• Video is coming soon. Today the skill makes images and interactive pages; interactive pages play the same walkthrough on load.
• Figures use population-average anatomy. They are not patient-specific: no CBCT or STL import.
• Implants are generic (correct diameter, length and connection type). No brand geometry.
• Jaw motion is an idealised average: no disc displacement, clicking or recorded jaw tracings, and the upper jaw is cropped (no sinus or orbit).
• Best results with the most capable model (Opus on Claude). Smaller models do well on topics with a ready-made example and are told when a figure has to be a schematic.
• For education and communication only, not for diagnosis or treatment planning.

Stay up to date

dental-explainer is made by Sixmonth. Get a weekly briefing on AI in dentistry at sixmonth.ai/newsletter.

MIT licensed. Concept inspired by the open-source Anatomy skill by @wheresryan22; the dental kit, facts file and figures here are original work. three.js © its authors, MIT.