What causes bad breath? what can you do to get rid of it?

bad breath
?MusicLover? asked:

according to my b/f i sometimes have bad breath, he says it smells kinda sour. um i brush and floss regualrly and i use mouthwash too.
sometimes i get sinus infections could this cause my breath to smell?
and what can i do to try to get rid of it?
any suggestions will help.

Rapid Cure for Bad Breath