I can't answer your questions completely, because I am not familiar with your nephew's orthadontist. I, however, had braces through from 7th grade through 9th grade. When they took them off, they put a small metal bar on the back side of my front lower teeth that would serve as a retainer and remain there permanantly. For my top teeth, I have a clear retainer (you can't even tell I'm wearing it) that I wear only at night...sometimes every night, sometimes every other night. I'm not exactly sure as to what sort of retainer plan your nephew is going to have, but tell him not to fret. Just consult the orthadontist and express your conern, I'm sure he/she will do their best to fix it. Braces are supposed to be a fix - not another burden. Good luck!