Dear Ono,
Bad breath can be caused by several factors. 1. Plague and tartar build up in the mouth due to not having any professional cleaning done. If this is the case get a good deep cleaning to get rid of the bacteria that causes bad breath. 2. Decay present in the teeth. If this is the case a full mouth exam should be performed and all the decay has to be repaired for the bad breath to go away. 3. Systemic (from stomach), if this is the case you should consult a doctor to make sure that there are no internal problems. Products such as mouth wash, toothpaste and mints are only temporary solution in the presence of any of the above conditions.
Dr. Maddahi
Kourosh Maddahi, DDS
General and Cosmetic Dentist
Beverly Hills, California