Something I haven't seen on the "to do list":
1. Floss your teeth.
2. Brush your teeth.
3. Rinse with hydrogen peroxide/water...50/50.
4. Altoids peppermints.
If don't floss regularly, do it the night before instead of the day of. That way most of the swelling & pain will occur while you're asleep, instead of during your interview. H2O2 will oxidize any nasty crud unearthed by the flossing and leave you with no breath smell. Altoids PM's will then top it off.
I'm amazed at the wretch I can smell on some people's breath from 4' away. There will just suddenly be this wave of foul stench. Obviously, they're oblivious or so used to it, they no longer smell it.
Good luck to you!