I'm not sure where to include it. It's been over two years since I looked at the application but I observed a doctor in a hospital for full time for two weeks who wrote me a letter of recommendation and I included that shadowing experience in my application.
Air Force HPSP Recipient
Dental Student Class of 2017
If you feel that it gives the schools a better glimpse of your values and your skills/assets, include it. Say, you volunteered at a clinic that has nothing to do w/ dentistry, just primary care, it shows that you have had hands-on experience with patients and you value volunteering and community service. Just evaluate if you think that experience can shed a positive light on you as an applicant.
I shadowed a physician assistant as well as a pathologist assistant before shadowing dentists. I mentioned those because I felt like it would show that I didnt just choose dentistry, and that I've explored other heath professions. I also mentioned it in my PS and listed reasons why I didn't choose that profession.