i just bought a knew mouthpiece and well i want to know how long would u have to play it for before u know its not ur kind or mouthpiece? i guess wat im trying to ask is how long is it before u get used to it? because ive switch from a 7c to a 5c and it really wasnt that big a deal. but now im working with a E14 marcinkiewicz and well its not really working for me at the moment. so how much time should i give it?

If the mouthpiece doesn't fit comfortably right away, it probably isn't for you. You need to "test drive" a mouthpiece before you take it home. Run some scales, play through the arpeggios. do some interval leaps. If your chops don't respond well now, they probably won't respond well later.

ya i see wat u mean. thanks

9th grade: 7 c
10th-11th grade: 5c
12th grade; 3 c or 1 1/2 c

ok then why dont all professionals play monnettes then??
theyre not that great
and theyre intensely expensive
mouthpieces should be chosen for the players best results
its a personal thing

Mouthpieces:

With emphasis on the notion that a mouthpiece isn't near as important as developing the focus of the air that goes through it, here are a couple thoughts regarding mouthpiece type and size.

If you are in marching band, jazz, and orchestra (or some variety like that) it can be helpful to have a few mouthpieces to get you through. In general, though, I recommend not trying to cut any corners by way of mouthpiece.

Also, for the student/developing trumpet player, I would suggest a medium to deeper cup over shallow. The deeper mouthpiece will give you a richer tone. If you get used to playing your "double highs" with a large mouthpiece, then you'll really crank on a shallow cup, wide rimmed mouthpiece.

It is definitely relevant to consider the type of music you are playing; however, while in school you are probably playing all types as you develop your trumpet skills. If you end up focusing on orchestral playing, then you'll probably wish to stay with a larger mouthpiece. If your playing professional lead trumpet, your most likely going to be doing so on a shallow, wide rim lead mouthpiece.

In summary, for students working on developing their chops, it is better to error on the side of too big(deep) rather than getting used to some pea shooter mouthpiece.

So which one and what size? My money would be on Schilke 17.
This mouthpiece is medium to large. Has good tone, but is plenty flexible for any genre of k-12 level play.
The rim is rounder and in my opinion much more comfortable and flexible that the edgier Bach and other brands.