I was a C.D.A. for over 10 years before  going back to college and recieving my degree in dental hygiene. To allow an assistant to perform such  procedures with no guiildlines is insane.  Even with guildlines it is insane , as a hygienist I view this as malpractice, a definate possible harm to the patients who expect the best dental care possible.To allow a DAII to use a highspeed handpiece in the mouth would be as dangerous as giving your child a loaded gun for a play toy. Please don't destoy the dental profession by allowing this to happen..