Are you brushing and flossing twice a day but still have bad breath?  Here are a few possibilities that may be the cause.

 First..could be bacteria on your tongue. Brushing and using a tongue scrapper twice a day could help to alleviate the bacteria which may be causing the odor.  You can also chew sugar-free gum (look for the ingredient xylitol, which helps a little to stop the growth of bacteria) and can help to sweeten your breath.

 Second…could be your diet.  Eating foods like garlic and onions with their pungent oils can linger on your breath for up to three days. 

 Third…could be gum disease, abscess or even a cavity causing your bad breath problem. Seeing your dentist is the best way to find this and getting your teeth cleaned regularly is most important.  If your dentist does not detect any of the above oral health problems then you may need to see your regular primary care physician.  About ten percent of chronic bad breath problems stem from digestive problems such as ulcers, acid reflux and lactose intolerance.  Another cause could be a sinus infection in which the mucus may drip into the throat.  

 Whatever the cause, bad breath can be offensive to those close to you and it is imperative that you try to get to the bottom of the problem.  Seeing your dentist should be your first option.