How can you tell if your breath stinks?

[fatima]

Well...My seatmate has the STINKIEST breath ever!!! )...and well I can hardly breathe when she talks to me...but then she seems oblivious to this )
Then realization dawned on to me....does my breath stink like this too? What if my breath stinks just as bad ( Even if i KNOW that this ISNT possible since hers can kill ) ) I brush my teeth regularly...once before going to school, once after lunch ( sometimes, depending on my location) and once at night!

How do you tell if your breath stinks?