As an experienced dental hygienist of 26 years, I am shocked and saddened that  our profession is being demeaned in this way.  Just exactly who makes the judgement  as to which patient has "just a little tartar to scale supragingivally or just 1mm subgingivally?  I can't tell you how many times over the years I've had a patient that initially appeared to be a class I patient and turned out to have deep, tenatious deposits.  This proposal is absurd and  would be a detriment to the dental profession as a whole.  Interestingly enough, the RDH has more actual training in scaling than the DDS.  Now we're going to delegate to the assistant??  I say NO WAY!!!!!