I just started Invisalign, but I am a snorer... my old 1-piece mouthguard won't work anymore, as my teeth are shifting, and I have Invisalign on now. I asked my ortho about attachments for elastics to wear at night, but he said they'd have to cut my existing trays and that was not a good idea. Is it common to re-order in the middle of treatment? Would there be a cost?