The "Professional Experience" section on the AADSAS application has 5 subsections where you can list up to 5 things each. The 5 subsection headings are: Awards/Honors/Scholarships, Dentistry/Shadowing Experience, Extracurricular/Volunteer/Community Service, Work Experience, and Research Experience.
Heck no! Make yourself a fake AADSAS account that you won't actually use this cycle--this is totally legal and fine--and get a look at the whole application. That way, you could maybe even start working on what you will use for your answers next cycle! Also, to get a head start, check the AADSAS FAQs link in my signature.
Also, keep in mind that you only get 150 characters to describe your experiences. That is NOT A LOT. So work on whittling down those activity descriptions.