Can a new Invisalign practitioner order retainers using the previous mold taken from the original Invisalign practitioner?

Even if you've already completed the Invisalign treatment,
Invisalign has a process for transferring your ClinChek and records to
another Invisalign certified dentist to obtain any additional aligners you may need. You will need to sign a few forms for your previous practitioner to release the records, but it shouldn't be too difficult. Hope this helps!Dr. G

 if you are really not satisfied with the result of your Invisalign treatment then you should this is another practitioner who should be able to give you the result that you want and deserve. that being said it is important that you use an orthodontist preferably and Invisalign Elite premier provider. However if you do not want to continue treatment as long as your retainer fits properly there is no reason why another practitioner cannot use existing impressions. Good luck