You guys are going about this all wrong. If you are in a one night stand you want to get OUT in the morning, not hang around and brush your teeth. My recommendations are:
Condoms
A Morning After Pill (just in case)
Subway Token/Emergency Taxi money (also for the morning after)
Soft shoe covers so that you can creep away quietly in the morning. something like this:
Oh and maybe a fake business card with a fake number just incase he/she wakes up and catches you halfway out the door.