I have a trumpet student that's in High School. He got braces off about 2 months ago. His father has a part time job going around to band directors repping for a local music store. Just before my student got his braces off one of the band directors (a trumpet player) told the father that a Bach 7C might not be the right mouthpiece for the kid. If he was getting to be a better trumpet player maybe a bigger size would be better. The student of course wanted to go to a 5C. I told him to go with what felt right and worked but, I don't recommend a change at this time. He started on the 5C just as his braces came off. Now I've been working with him for 2 months or so and this band director sold dad his old Strad and recommended a 3C. Now I'm working with a new trumpet, new mouthpiece, and no braces. What else can we throw in the mix? The trumpet is a nice trumpet but, not needed. Why can't this band director keep his big mouth shut? He never talked to the kid never mind hearing him play!