Food – Food that collects on and between the teeth can collect bacteria that produce odors.
Poor Dental Hygiene – Remove plaque, which contains bacteria, from your teeth, gums and tongue every day. Cavities and gingivitis can also cause bad breath.
Tobacco Use – Smoking can cause chronic bad breath from the build-up of tar and nicotine as well as reduced saliva flow.
Medical Conditions – Respiratory tract infections, chronic sinusitis, postnasal drip, chronic bronchitis, diabetes, gastrointestinal disturbances or liver and kidney ailments can contribute to bad breath problems.