That would go under your ECs. When you're trying to classify your experiences, the best way to do it is group everything you received income for under "work experience" and everything you spent your time on without pay under "extracurriculars/volunteer". Then take out your dental experiences (ie/ shadowing, campaigning, assisting, etc.) as that will go under a separate section "dental experiences". Don't double count your hours as that'll reflect poorly. Any executive positions, members of clubs, volunteering, sports-related activities would go under EC. Hope that helps.