Switching from dentist to orthodontist for invisalign?

Ok so I'm switching to an orthodontist for my invisalign case. I will have to start all over since my regular dentist did not have me in rubber bands to correct my bite. My remaining balance at my dentist is 1500. I called to tell them my plan on switching and asked for my to date Balance that I'll owe. The receptionist told me I owe 1500. How can I owe the full Balance when the cost of revisions and retainers are included? Please someone explain what I need to do.

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