I had a hard time begining my essay as well. I went to essayedge.com to look at some of their samples. Here is a link to sample Dentistry essays. When you get to the site, type in the word "dental" in the search and it should come up with 4 samples that relate to dentistry.
http://www.essayedge.com/medical/essayadvice/samples/
Basically, I asked myself some important questions that I thought would be good to introduce to any admissions committee.
1. How did I become interested in dentistry?
2. Do I have anything that would make me stand out? I.E. I am a dental assistant; I have volunteer work; etc.
3. In the first paragraph, I tried to make it the most interesting. I told a little story of a past experience as a dental assistant.
4. What are some goals? Interests? Is it to own a thriving practice... Or to go into research.... or to go into academia... or to help the community? Let them know some of your short term goals and long term goals.
5. Then, I tried to sell them on why I would be such a great dental student. I thought of everything I could think of on why I would succeed in dental school and dentistry. I tried to convey how I could contribute to any dental school.
I'm not a very good writer, and this was difficult for me too. But, everyone has to do it and boy does it feel good to just get it over with.... By the way, I paid 140.00 for the application service and it helped but wasn't worth the money. But since I don't know anyone to edit my paper, i would do it again. Hope this helps...
Good Luck!