Hello, I am a Dentist from Venezuela and a Registered Dental Hygienist in Florida. Along more than 18 years of dental practice and experience dedicated mostly to the Dental Hygiene area I have become to learn that there are several causes for bad breath or "Alitosis" like dry mouth, stomach problems, cavities, etc but the MAIN cause of this condition is "LACK OF DAILY FLOSSING". Most of the people who suffer from this condition just DON'T floss. When you don't floss ALL contacts between ALL your teeth, plaque builds up under your gums and between your teeth, in less than 8 hours this plaque becomes BACTERIA and of course, with time if not removed properly, it turns into hard deposits of tartar. This is a chronic process. Lack of flossing can also led other type of health problems that can affect vital organs like the heart, kidneys, lungs, uterus, ovaries, etc.