you actually can change providers once you have started this process with no extra cost as far as Invisalign goes. you just need both dentists to sign off on a transfer of treatment agreement, you will need to pay for the additional appointments with he new dentist, but Invisalign will not charge you. I recently moved and am going through this process now.
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Posted to Ripped OFF - Bottom Teeth Never Corrected, Despite 27 Aligners on 12 Oct 2010