I took a 3 year break from playing the trumpet and I got back into it this year, recently starting lessons. I have both a Bach 3c and a Yamaha 16c4 mouthpiece, and I recently switched to playing the 16c4 because with it I could play Gs and As above the staff about a thousand times easier. During my lesson today mt teacher strongly told me there was NO way I should be using a 16c4 over my 3c so early into playing the instrument. Is it really that bad to use a 16c4 over a 3c? If anything I feel the exact opposite of how he feels and I have an overall much easier time playing my trumpet with the 16c4 than the 3c.