An odor in the mouth may be the combined odor from the mouth, nose, throat, esophagus, and gastrointestinal tract. Eating food containing irritating odors, poor oral hygiene habits, digestive gases, and disease causes can all cause odors in the mouth. According to different reasons, different ways to eliminate odor can be used, the main solutions include: 1. Good hygiene habits: brush your teeth carefully in the morning and evening, eliminate the residue and plaque in the teeth and tongue, and maintain oral hygiene can effectively reduce odor. Regular dental cleaning, some stubborn calculus will produce bad odor, dental cleaning to remove calculus can significantly reduce the odor in the mouth. After eating garlic, onions, radish and other irritating foods or smoking and drinking, you can use mouthwash or mint tablets to cover the odor; 2, stop or replace drugs: some drugs can cause odor in the mouth, such as ethanol, nitrite, metronidazole, thiourea, etc., these drugs can be restored after stopping the use of the odor in the mouth; 3, treatment of the original disease: the odor in the mouth due to disease, should first treat The primary disease causing the odor, oral diseases, such as gingivitis, dental caries, pulpitis, periodontal abscess, etc. should go to the dental hospital for treatment; the H. pylori bacteria produced in the gastrointestinal tract need to be killed by drugs, such as the application of penicillin, erythromycin, ofloxacin, etc.; systemic diseases such as diabetes, uremia, cirrhosis of the liver, etc. cause a special odor in the mouth, need to go to the hospital for long-term comprehensive treatment. Generally, after curing the original disease causing the odor, the special odor in the mouth can disappear.