Hello all, I have an interesting issue, after practicing I usually notice a strong black discoloration on the rim of my mouthpiece. I brush my teeth before playing religiously, and I'm using an SM4U. I also wash my mouthpiece before and after playing. I'm fairly sure it's not the brass underneath poking through, since I can just easily polish it back. It seems to form in the same spots every time, one large spot and 2 smaller spots.
Thanks!
Edit: I should add that it's silver plate
Thanks!
Edit: I should add that it's silver plate
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