if I have a permanent retainer on my top two front teeth, is SmileDirectClub still a good option to fix gaps? (Photos)

SDC is a simplified forn of Invisalign treatment. What you would be missing out on is the expert opinion of a dentist as to why your gaps are coming back. It is usually due to your bite, clenching or failed retainer. You would have to have the retainer removed, aligners fitted and then a better retainer provided. Invisalign is always a more comprehensive option that DIY orthodontics.