Sorry, I disagree. I wrote my essay as if it were a letter to the reviewer. Because that's really what it is. This is not a contest in English composition. Be direct and concise. Cute anecdotes, metaphors, gratuitous illustration, and other demonstrations of "creativity" are inappropriate. Besides, you are probably not as talented with language as you think you are.
This is your first opportunity to introduce yourself to the admissions committee. Tell them who you are, why you're submitting an application to dental school, and how you need their help (ie, why you're pestering them). Be certain that your essay makes clear why you want to enter the dental profession, how motivated you are to achieve this goal, and why the admissions committee should take a chance on you. Don't narrate the front page of your AADSAS; rather, emphasize anything that you believe supports your candidacy that you haven't yet been given to opportunity to relate. Respectfully,
Tails