Even though I brush my teeth, my mouth smells, what should I do?

Halitosis has become a very important problem not only in our country but also in the whole world. in 90% of the patients, it is caused by intraoral or surrounding  tissues (nose, sinus and throat), and in 10% of patients it is associated with systemic diseases. For oral reasons, dental origin is only one out of dozens of reasons for bad oral odor. Therefore, even if you brush your teeth regularly does prevent bad oral odor . A systemic-induced bad oral odor can be caused either by an existing systemic disease, such as diabetes, or by the medication you are taking from the disease. In fact, an individual may have more than one reason that can cause bad oral odor. Therefore, it would be appropriate  for your dentist to investigate the possible causes and to get the opinion of other specialists  if necessary.