Use of the highspeed handpiece correctly, without causing harm to a patient, takes years of instruction and knowledge.  Removal of dental caries may look technically easy, but done correctly, is as difficult as removing a cerebral neoplasm.  Extensive knowledge of anatomy, physiology, biochemistry, microbiology, pathology and more is required.   Hand-eye coordination and psychomotor skill is very challenging, but can be learned in a few years of pre-clinical and clinical instruction.  Knowing how to use a handpiece, and where and when to use it correctly, takes years of education and clinical monitoring.  Even after 4 years of dental school, most graduates are barely able to use a handpiece successfully and without causing harm.  Non-dentists have been trying to classify dentistry as a mechanical trade for years, and will continue to do so.  Dentistry became a reliable and worthwhile profession almost 200 years ago, when science, high-level education and clinical mentoring replaced technicians and tradesmen.  This is another attempt to reverse the advances made by dentistry and medicine for purely financial reasons.  We owe the public the right to have properly educated and trained personnel providing medical and dental care.  If DA2's want to use a high speed handpiece, there are plenty of dental schools waiting for their applications.