I am 20 years old and do have a slightly narrow palate and am being treated with invisalign. I was looking to possibly get a palate expander following my alligners (i know this doesnt make much sense). I want a much wider smile. Can a palate expander slightly increase the nasal airway This is not a severe case, however I think I could definitely benefit with increased air flow of the nose. As it stands, I can breathe through my nose no problem, just not as much air as through my mouth.