God you newbies are so ill-informed.
Upper and lower expansion has been discussed AD NAUSEUM on this f**king cite.
To make a long story short you'll have a hard time finding anyone to do lower jaw expansion.
The upper jaw is expanded as an alternative to bicupsid removal to deal with crowding (unfortunately something i had done which made my arch smaller than it could have been).
Though the upper is limited by how wide the lower is. If you have a lower narrow jaw, you're upper can't be expanded that much. But theoretically you can expand both to fit all your teeth.
This doctor does both, but it's not recommended. First high morbidity of lower teeth, that is you have a high chance of losing some lower teeth since this surgery is very invasive. Second, you'll have to wear a terribly uncomfortable device around your lower teeth and gums for upto at least 9months to a year. Then remember you have to do the same procedure to your upper jaw!
This guy does it. I talked to him and one of the guys who invented the procedure. This dr. kasey li guy said he'd see me for a consoultation but then someone else said forget it.
I should have just had upper expansion without any tooth removal. I didn't know s**t like 3 years ago when I first got braces.
http://www.sleepapneasurgery.com/maxillomandibular_expansion_children.html