I have been wearing invisalign for about 10 months now and just went in for my last 3 trays. I pointed out to the orthodontist that one of my teeth hasn't moved much and we are almost at the end. He said I have to wear my last tray for 6 weeks because the last tray has the most force and he wants to see what it does. I have been wearing them for 3 wks each and I don't see how extra 3 wks is going to make a difference. Is he right or giving my a runaround to avoid revisions?