I'm new, just posted on the intros page. Been searching for old discussions on this issue and didn't find anything. I'm a newbie trumpet player. A: How far apart should the teeth be? I know, it differs from player to player. Mine tend to be about the width of my tongue apart. B: Does the aperture change through the range? For high notes, I am tending to bring my teeth closer together. Thanks in advance for your thoughts.