Had my old retainer since 2016 when I took the braces off and decided to make a new one with sporting smiles, I received the kit, did all the steps on the instructions and then sent my photos for approval, and then sent the molding back, they sent me my new retainer after days and it's perfect! Super easy and convenient to do it at home, I've been using it every night for a year and it looks as new as when I got it. Very satisfied! Will order a backup for sure.