If you stick them down with cyanacrolate (superglue) you get a nice bond but the white residue will need to be cleaned up afterwards, other than that, it's a case of carefully flattening down/straightening out the track very carefully using the bent end of an engineers scriber and depositing the smallest amount of glue you can physically see on the track and holding down and flattening out as you go.
After it is set, remove any residue and scrape off some of the insulator, enough to get some solder on and either make a solder bridge (assuming the tracks are butted up against one another) or salvage some copper strip off an old pcb for a bridge or a wire bridge.
If the track in question is in the powerline or signal no probs, if in some kind of feedback loop, you might want to keep it as minimal and neat as possible, feedback is funny like that.