If you are brushing at least twice a day, flossing once a day, (and as wisely mentioned above) brushing your tongue and drinking a good amount of water and of course getting that sticky plaque and tartar removed by our dental friends every 6 months.....the bad breath problem may be due to sinusitis or a medication that your on. After following the regimen above and you still have halitosis, seek professional advice from a dentist.