Are the last three trays of Invisalign treatment necessary and essential?

November 3, 2018
Asked By:ttackett86 in Louisville, KY

My dentist advised me that the last 3 trays of any given invisilign treatment are extras. I’m on tray 19 of 26, but he said he hasn’t had anyone use the last 3 trays, so I’ll be finished after tray 23. Why would my treatment be for 26 trays per Invisilign if I didn’t need all 26 trays?