SmileClubDirect has ceased operations.
If any of you were participating in that, the lifetime smile guarantee is no longer in existence. If you bought their services on a credit card, you may be able to successfully argue for chargebacks on their account because part of your purchase price and your entire purchase decision we're based on the fact that it was a lifetime smile guarantee.
This tactic has worked in the past and I wish you luck and having it work in this case.