"Orange Crap" on the mouthpiece
First of all, a deposit on the area of the bite plate area ( as well in the chamber) could be caused by several things: food in the mouth while you play, nicotine if you smoke, skin cells from your lip (most common and obvious on hard rubber mouthpieces), sugar which is in your bloodstream and saliva, and mold (which may be growing on either the skin cells or the sugar/food deposits)
The solution for food deposits and nicotine stains are obvious. Skin cell deposits are nothing that you can do about. Stop smoking, brush your teeth, and clean the mouthpiece frequently. If the orange deposit continues to return despite your efforts to keep the mouthpiece and your mouth clean, you should be tested for diabetes.
Diabetics by definition have abnormally elevated and sustained levels of sugar in their blood. The sugar also appears in the saliva even after brushing and mouthwashing. Consequently, untreated and uncontrolled diabetes leads to tooth decay (because of the sugar in the saliva).
I can't imagine anyone having such a bite problem that his teeth move as a result of playing saxophone without other existing symptoms such as jaw and muscle fatigue and pain.
To me, your problem suggests diabetes with the attendant dental complications caused by prolonged uncontrolled elevated blood sugar levels. Diabetes is easily diagnosed, but it requires repeated testing over time (which you can do yourself with a $20.00 glucose meter purchased at most drugstores). The best thing to do is to have a test performed by your doctor.
My intention is not to scare you. I do recommend that you have this possibility eliminated. Statistics show that both type 1 (insulin-dependent) and type 2 (d.melitus) diabetes are on the rise in America. Often, people live with the symptoms (which are often ascribed to other things) until the symptoms become unbearable and the diabetes has gone wildly out of control.
I ain't no doctor, but I am a diabetic.