It has been almost 2 months since my impressions were taken and we are now on version 5 of the Clincheck. My case has consistently come back 12 trays plus 2 over corrections. Have approved the top but biggest problem is the IPR on bottom...one came back with a cumulative 1mm (top was not right on this one) another 1.3 and another 1.7mm for essentially the same movement. Is it normal to have that many Clinchecks or is my dentist just not providing clear prescription instructions?