How can you tell if you have bad breath? How do you cure it?

bad breath cures
Bear-tan asked:

My friends and father say I have horrible breath. I tried the “licking hand” method, and smelled something, but it wasn’t anything good or bad. The “breathing into your hand and smelling it” doesn’t really work for me either. I brush my teeth after every meal (except lunch, because I am at school then), floss, and use mouthwash. I also brush my tongue with fresh toothpaste. (I use Colgate.) My dad thinks that I have bad breath because I don’t get enough rest so I suffer indigestion. I don’t know if this is true or not, and he says it isn’t something I need to consult a doctor with.
What can I do to tell if I actually have bad breath or not? And why?
If I do, how can I help it???
Also, my mom says my breath is fine, which just adds to the confusion.
Again to all of you; some people say I have horrible breath, some say it is fine.