Adding to the above comment, shadowing dentists gives you a pretty good idea of what an actual dentist operates like, how each run their own practices and how they interact with patients. It's really important to get this experience as much as possible, because you can learn a lot from them, and many are eager to mentor you. Schools may not explicitly look at __hours shadowed (although I know they do this in the States), but your shadowing experiences are definitely where you can pull valuable lessons and things you may want to mention during the interviews. When you shadow, it's a lot more than just watching them operate, but watching how they work as a health professional, with their patients, with their staff.
I personally asked my own dentist if they would let me shadow, and if they knew of any other GPs/specialists that would be open to students as well.