Can my orthodontist file down the glue on a permanent retainer on the back of the top four front teeth?

If you have had some slight movement, your retainer may be able to take care of it.  If you can fit it all the way in, that is a good sign.  I'd wear it full time until the pressure goes away.  It might be several weeks.  If it doesn't take care of the problem, or if you...

You need an orthodontist opinion, find one by asking around where you live or get referred by your dentist. 

Unfortunately, braces alone can not widen a jaw.  Braces can however widen the arch form of your teeth, but only up to a safe and acceptable limit.  A good system to consider for expansion and dental arch development is the Damon Smile system.  Keep in mind that if you truly have...