I talked to my local medical lab, B.C. Biomedical Labs, and asked what your options are. They indicated that you can do three things:
- Brush your teeth, tongue and roof of your mouth then rinse thoroughly to minimize swallowing any toothpaste.
- A little bit of mouthwash is acceptable but spit and possibly rinse with water to minimize swallowing any of the mouthwash.
- Do nothing. Go in with bad breath and all but have a mint or some gum handy for after your test is over.
Of course the best thing to do is to call and speak with your doctor and/or medical lab before hand to confirm what is acceptable.