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Once in Anatomy.TV, use the left-hand menu and select Clinical Specialties. (Note: You may also want to look at the other options in Anatomy.TV, such as the default 3D Atlas with useful regional anatomy).
Once you've selected Clinical Specialties, the Dental Hygiene module displays.
After you've selected the Dental Hygiene module, there are help options on the screen. With how much you can do in Anatomy.TV, please consider using the help sources to get the most out of this great product!
Check out these tutorials to try to get the most out of Anatomy.TV.