Does anybody know if there is a fee/cost for a lost aligner? I lost my very last one. Anyone know?

Sorry to hear you lost your tray. Its especially a bummer it was your very last one - ugh! :-( Do you know if the dentist was planning on doing a set of refinements for you? You might want to ask, because perhaps you could just skip to the refinement trays??

Here is a Q&A that will probably be helpful:

What's the Cost of Invisalign Replacement Tray?