What are these mystical college essays, anyway? What prompted your thinking? However, it is crucial that you reflect on this from a perspective of growth, resiliency, and capacity for improvement, rather than focusing on the negatives.
Let your hand roam free.
Unfortunately, willpower and desire were not enough. Use polished prose that represents your genuine voice and reasons for pursuing the profession, and write in a way that will be comprehensible even to those outside this particular specialization. Make a list of experiences that have been important to you.
This might be as simple as holding a hand while the dentist performs the procedure. It was attached to my helmet, but I had a chance for the puck, and I took it. While technology is at the forefront of change, what remains consistent over time is the importance of communication and accountability to provide excellent patient care.