Yakima? That's in Wash. state right? Best thing to do if you're applying to UW is email/call and talk to the adm. office to see if you can speak with the dean or coordinator for some info. You might want to ask for some dental students' emails so you can correspond with them and have some insight into student life at the school and about the city. If you're in the area go visit the school...tell the dean or adm coord. that you're interested in touring the school. I remember some schools actually have tours for people in the community, so see if there are any tours you can sign up for.
If you don't want to call/email, then write a letter to the adm. office informing them of your interest in their program and give a brief description of what you're doing at the moment (like volunteer work, extracurriclars, etc. ). Get as much info as possible regarding the school and look at what the main goals of the program are...is it a research oriented school or more clinical or something unique they offer...then write a comment regarding how their program meets your needs.
Once you have contact with someone in admissions, then inform them of any new developments in your application like updating transcripts or new activities or projects your partaking.
Well, good luck to you!