Brass players often ponder embouchures because the way our chops do their work is so critical to the results we get out of the horn. When I was as undergrad the trend was to try to get all players to fit a specific model - slight "frown" at the corners, mouthpiece pointed downward somewhat. I had to negotiate a bit with my instructor because my teeth do not have the more common overbite, but rather have a more-or-less even bite (the top teeth are roughly even with the bottom teeth). It was impossible ...