Essix retainer cost for just upper teeth.

February 16, 2015

can someone please let me know , after my invisalign , doctor recommended to wear my last aligner as the retainer . its been over 5 years wearing the same retainer .Is it hygienic. is it safe to wear the last aligner for so many years? i want to change to new retainer . he says the cost for just one retainer is $300 that too its essix not invisalign (vivera) retainer?i read here , the cost for one essix retainer happens to be $100 to $200 . Sounds like $300 is too much for just one essix retainer?can any orthodontis or dentist please help with cost clarification , is this normal rate?