Mr. Laureano,
My trumpet teacher noticed at my last lesson that my bottom lip tends to roll under the top lip the higher I play....this has never been a problem for me up until now. I don't know why it started happening (unless it's a side effect of marching band....

) and I would like to correct it as soon as I can.
Do you have any ideas about what to do? Any thoughts about why, out of the 8 years I've been playing, it should start happening now?
Thanks!
Lara