A study atlas, built like a reference book

Why it exists

Board prep is usually split across paid question banks, flashcard decks, scattered technique videos and thick textbooks. Hygiene Atlas puts a visual reference and active study in one free place that works well on a phone between classes or patients.

How the content is written

• Original wording. Every summary, card and question is written from scratch. Nothing is copied from JCNDE materials, prep books or other study sites.
• Traceable facts. Each fact comes from a named public source such as the CDC, ADA, AAP, AHA, FDA or JCNDE. The full list is on the sources page.
• Current guidance. Content follows the 2017 AAP/EFP periodontitis staging and grading, the AHA 2021 endocarditis prophylaxis update (no clindamycin) and the ADA 2024 advice that thyroid collars and lead aprons are no longer routine. Where older material or state rules differ, the page says so.
• Both blueprints. JCNDE expects updated NBDHE test specifications in November 2026. Topics show item counts for both versions.

Images and video

The hero and section art are original 3D renders made in Blender for this site. Photographs, radiographs and anatomical engravings are public domain or Creative Commons licensed, with the author and license shown under each image and collected on the sources page. Videos are official YouTube embeds from their creators; nothing is re-hosted.

Your data

There are no accounts. Study progress is stored only in your browser on your device.

Disclaimer

Hygiene Atlas is a study aid, not clinical guidance, and it is not affiliated with the JCNDE, ADA or any testing agency. Follow your program, your state practice act and current agency guidance in the clinic.

Updated October 2026.