Watch your system pressure carefully....*
My next door neighbor is a retired dentist, and I have previously talked with him at length about getting set-up to use a dental handpiece for carving and piercing. One of the most important bits of advice (no pun intended!) he gave me was to be sure the regulation of air pressure was carefully controlled and reliable. In a 35+ year dental practice career he said that he had destroyed more handpiece turbines due to bad regulation of the air pressure than anything else (malfunctioning regulators, initial pressure set too high, etc.). The advice about lubrication, etc. already posted is good, but above all, don't use a cheap regulator and get one that can be adjusted fairly accurately. In general 30-40 (maybe 45) psi is the target, but pressure requirements will vary by brand and style of handpiece.
Rob Wallace
*Maybe this is also good advice for participants of the "AAW Information" threads....???