I had braces when I was a teenager. Train tracks. They were lovely and straight and on the whole they still are. But back then I had to wear a retainer at night for about 3/6 months after the braces came off and that was it. Now my bottom teeth are still straight but my front teeth have moved slightly. There’s a slight crossing of them and I’ve thought of Invisalign to fix them back to being straight. It sounds like it wouldn’t take long for just a slight overlap? Would have to see the cost though as I’m not a Mrs moneybags like Beggy