Well, the thing is, perhaps your dentist is an average dentist, but nobody has the data to know that. Perhaps ALL dentists are pretty average, save for perhaps a few who go to conferences, have a blog, go on dentistry techy-forums in their spare time, or buy random dentistry gadgets to try them etc etc.

For example, my local butcher is a 'geek butcher'. He tries new cuts, goes to butchery meetups at food festivals, try tosource new things, etc; result is that he's really good at what he's doing, and he gets quite a few loyal customers.