How many science classes are required to be a dental hygenist?

The number of science classes required to become a dental hygienist varies depending on the specific educational program. However, it's safe to say that you'll need a substantial number of science courses, typically including:

* Biology: Usually a full year (two semesters) of general biology is required.

* Chemistry: Often includes both general chemistry (often two semesters) and possibly organic chemistry (at least one semester).

* Anatomy and Physiology: A full year (two semesters) covering human anatomy and physiology is almost always mandatory. Sometimes these are split into separate courses. Dental anatomy may also be required.

* Microbiology: A course focusing on microorganisms is frequently a requirement.

Some programs might also include other science courses such as biochemistry or human biology. It's best to check the specific admission requirements of the dental hygiene programs you're considering, as the exact number and types of science courses can differ.