Bad breadth is a symptom of gum disease.The formation of tartar and plaque causes it.It may also be due to lodging of food particles in between teeth and inside decayed teeth. Please visit a dentist and get the check up and scaling/cleaning done. You will feel much better and gum will be healthier.

Few things that you can do Visit a dentist for cleaning your teeth and to Find out if your bad breath originates from mouth or if there is other cause Brushing at night and using tongue cleaner Drinking plenty of water and keeping your bowel habits clean I.e no constipation or gastric reflux/ Starving also can cause bad breath.