How do you adjust a pallet expander?

The orthodontist will give you a little key. It's basically a blue plastic stick, a little longer than your index finger, with another little metal stick on top, about the length of your nail. There's a hole in the expander that the metal stick goes into, and you push it towards the back of your throat. Do that every night for as long as the orthodontist wants you to. It was 28 days for me. Over time, you should have a gap between you teeth. If you miss a night, don't do two turns the next night, just keep going from where you left off.

A picture of the key:

http://2.bp.blogspot.com/_GykSABZFb_A/SNlyfKx-PMI/AAAAAAAAAO4/wuV0-G1Uziw/s320expander+key.gif