A good dentist could be anywhere
In today's market, finding the right location isn't as important as being visible on the web. Ofcourse you don't want to open an office right next door to another but you know I'm in california and every corner probably has a dental office, in reality, if you are good and people like you, you will be successful wherever you are. what's very important is to do a search on google and see how many people you will be competing against locally, I'll give you an example go to google and type in corona del mar dentist, this is my area, there's a quick count of how many people are competing for that, than do another search newport beach dentist and see how many are competing for that top spot. Corona Del Mar is about 1 mile away from Newport Beach, so more and more people are using the internet to find a good dentist, doing a good job is very important because everyone will know via the net. More importantly is if you are doing a good job and they are talking about it, you want to be able to show up in order to have new patients. gimics, themes, bla bla bla, people still want excellent dentistry, just make sure you are smart in maybe not picking the most populated (dental office areas web wise) you could be 3 feet away and better off.
Good Luck!