Dental Hygienist National Examination Practice Tests This is a set of the DHS National Unified Practice Tests, covering the 2nd and 3rd sessions. The 2nd session includes the questions, photos, and answer key. For the 3rd session, I've lost the photos, so it's just the questions and answer key. The answer key has small photos, so you can still solve the questions. There are some writings on them. Please feel free to comment if you have any questions ( ◜ᴗ◝ )