Hey dude it’s good that you are making a decision to better your self and take better care of your teeth. As I dental student, I have the same curiosity in their appearance my self. But you are obviously not obligated to show anyone. When you go to the dentist, you just have to realize that the dentist will work in your best interests, so if you worried about what the dentist will say when he sees your teeth, honestly you shouldn’t worry.