Do You Have a Target Market?

My simple test for whether or not a target market is big enough is to, you know, so if somebody says, i want a target dentist. If that group of people have a conference that they go to every year? And if the answer is yes, then that's a good sign. It's an overlet. Its accombination and the try to find the overlap. O, do you worry about other people competing in this space? Or do you say, i'm going to blow em out of the water with my marketing if there are absolutely no competitors? That makes me a little bit nervous.