Is it imperative to have lip filler dissolved prior to having braces and jaw surgery?

Part of this may depend on when you got the filler. If it is brand new, they may recommend getting it dissolved. If you have jaw surgery close to the time you get filler, there is a good chance it will be moved or migrate outside the lips. If you have had the filler for 6+ months, there really isn't a reason to have it dissolved (unless your lips are hugely over projected). As for orthodontics and getting braces, lip filler should have no impact. Again, if you recently got filler, having braces put on may migrate the filler. In the end, lip filler does not have any impact on your treatment plan. The surgeon should be basing everything off xrays/imaging and the movements needed to get your jaws into the perfect position. Jaw surgery usually takes weeks or months or plan, especially if you need braces before the surgery. That will give you plenty of time for your filler to start to dissolve on its own.