How to get rid of bad breath?

bad breath
iDK iF HE LOVES ME TOO? asked:

i mostly have bad breath, and i dont like to talk to my friends, teachers, strangers in my school, and BOYS when my breath stinks!! i wanna kno how to get rid of it. i brush my teeth twice a day, as well as my tounge. even the roof of my mouth! so idk whats wrong.

besides going to the dentist, what can i do at home to make it go away?