- READ the 10 Minute Bad Breath report NOW!!! There are different reasons for having halitosis. It is possible to have halitosis due to poor dental hygiene. The obvious signs of poor dental hygiene are gum disease and cavities. This is the result of not brushing and flossing regularly. Also, if you don't visit a dentist on a regular basis your dental health will suffer. These are problems that are easy to get under control.