DD is the same, really feral smelling wet nappies. Hadn't related it to teething until you mentioned it but makes perfect sense. As for when you'll see teeth it could be tonight or next month. Teeth have a habit of going up and down before breaking through so hers might be doing a bit of a dance under the gum doona and just waiting until the right time to pop thru.
And I do the same as Kass, if DD has a chomp she gets a sharp no, gets put on the ground and let there for a few seconds then put back on. Funnily enough she doesn't seem to do it anywhere near as much now...