If you brush their teeth every morning, and have gotten them a dental recently (within the past year or two) it could be a digestive issue. I had a foster who still had pretty bad breath after a dental and I mentioned it to the vet. That was what he told me, it could be coming up from the digestive tract not necessarily bacteria in the mouth.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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