From what you have posted, it is really not possible to answer your question. Was the $5,000 bill to cover all costs? If so, then you may have an argument to force him to do all work contracted for or return that portion of the fees attributable to removal, retainer and treatment. Alternatively, if as I suspect, the $5,000 covered installation and treatment up-to removal, then you still owe for the remaining work. Go back and read everything you were provided when signed up. You may also wish to put in writing to the orthodontist's office a request that they show you why you have to pay any more money to have the remaining work performed.

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