SDN Members don't see this ad. (About Ads) As far as EC' go, I have 90 hours volunteering/shadowing at a very busy dental clinic and thousands of hours of work experience (not dental related). I am not taking any classes this summer and would like to boost my EC's do I don't have to worry about it. I plan on shadowing an Oral Surgeon and a few more dentists. What does everyone recommend in terms of enough hours? thanks.