Dunno about this..................... Think of all those spot-on flea/ tick treatments that are absorbed thru skin e.g. Advantix, Frontline.
I bet she smells wonderful.
To get your gum out use citrus oil, available from hardware stores or get some lemon essence from the supermarket (same thing) You might need to dab it on the gum a few times but it will get it out eventually.
good luck