Halitosis in pregnant women may be caused by physiological factors, gingivitis, dental caries, etc., and is treated according to the cause. 1. Physiological factors: Pregnant women do not pay attention to brushing their teeth during pregnancy or do not rinse their mouths in time after each meal, which may lead to the presence of food debris in the mouth, thus inducing bad breath. In addition, pregnant women often eat onions, garlic and other heavy flavored foods, can also cause bad breath. These are physiological factors, do not need treatment, develop the habit of brushing teeth in the morning and evening, rinse after meals, bad breath symptoms will improve. 2. Gingivitis: pregnant women with gingivitis will also have bad breath symptoms, this time you need to be able to clean the mouth through scaling, but also follow the doctor’s orders with chlorhexidine gargle and other gargles. 3. Dental caries: if the bad breath of pregnant women is caused by dental caries, you can brush your teeth, gargle and other ways to clean the mouth. If necessary, surgical treatment. It is recommended that pregnant women seek timely medical treatment and follow the doctor’s instructions to choose the appropriate measures for treatment.