I did my EPQ (grade A) with the intention of doing dentistry at university, so I chose to focus mine on evaluating the validity of bite marks as identification using case studies and some of the laws that have been brought in since bite marks were first considered in court. This wasn’t too focused on dentistry as you can tell, but showed what dentistry can be used for in different fields. The main thing about your EPQ is that it should really focus on a specific topic. Mine was a little broad, so I ended up writing way too much and having to cut down a lot of words.