There is a ton of preclinical sim lab stuff. Almost all 2nd year is spent prepping on manikins. 1st year is now a little less hands on as they have recently started taking Part 1 Boards after the 1st year.
As for actual patient stuff, there are some Community events that are done where cleanings and sealants are done (for example: at the local hygiene program's school).
The most important thing is does the 1st 2 years prepare you for your last 2 years of clinic and dealing with patients, and I think the SIU program did a wonderful job of preparing for it.
Hope this helps and feel free to ask anything else about the program!