I’m on Invisalign’s now, but I’m 40. I don’t think I’d recommend them for a tween/teen. Kids eat and snack a lot and you can’t eat anything with them in and are only supposed to drink basically water or beverages without any kinds of dyes/coloring (so no coffee or soda). Think back to your own time in school … your friend would take out their retainer to eat, put it in a napkin at lunch, forget the napkin or throw it away and then everyone was going through the trash looking for Katie’s retainer. I think traditional braces are better for that age range. If they need additional treatment once they hit the post-college years, maybe then Invisalign.