Three clear starting points
Play the dental anatomy game, plan a grade, or open a course guide without walking through a course portal first.
Independent · Student-built · Course-ready
The study layer dental school was missing.
Fourth Canal is a public dental study desk: a visual anatomy game, a grade calculator, and focused course guides built for the browser.
ANATOMICAL TRACE04 / 04
The canal that is easiest to missis the one worth learning to see.
Why Fourth Canal?
The extra canal that can hide in plain sight.
A maxillary first molar may contain a second mesiobuccal canal—MB2—beyond the three canals students first expect. It can be narrow, covered by dentin, and difficult to locate. Endodontic treatment depends on finding, cleaning, and sealing the full canal system rather than stopping when the tooth only looks complete.
Fourth Canal follows the same habit: look again, find the context that was easy to miss, and connect it before moving on.
“The name is a reminder that the most useful layer is often the one nobody organized for you.
How it works
A calmer way to start studying.
The webpage is the document
Course Mastery Guides and Textbook Companions are searchable, responsive reading experiences—not files you have to download first.
Open first. Account second.
The core tools work immediately. Signing in saves progress and preferences without putting the public tools behind a login wall.
Independent by design
This is an independent student-run study tool, not an official university platform.
Editorial policy
Student-built, source-aware, and correctable.
Rick Ahn — dental student, founder, and student editor of Fourth Canal. Public study tools and guides are prepared as independent student resources, with source context and clear limits rather than claims of university or faculty endorsement.
Content can be incomplete or need correction. Use official course materials, faculty direction, and clinical sources for decisions that matter, and send a support report when something needs review.
Open dental study desk