I shadowed an ortho once, for a week. I just watched.
I interned with a General dentist for 4 years, I assisted with every procedure he did. I got a great understanding of why he was doing stuff and patient interaction, but I really wish I would've paid more attention to HOW he was doing things.
Worked for an oral surgeon over the summer. Assisted like crazy. Saw tons of really interesting things. This summer, I'll be able to assist in the OR, now that I am officially a "dental student". How exciting!
Um one of the other things I recommend is always get a good look/feel of any significant pathology if you can. Lesions, tumors, anything. It's super helpful to start experiencing what is normal vs abnormal b/c that is something hard to "practice."