If you brush your teeth every day and still feel bad breath, it is recommended that patients go to a professional hospital to check the situation inside the mouth, whether there are more cavities or whether there is periodontitis, if it is caused by cavities or periodontitis, it is recommended to treat the symptoms. After dealing with all the oral diseases and oral problems, then use mouthwash to maintain good oral hygiene, bad breath will naturally subside. If there is no problem in the mouth and good oral hygiene is maintained every day, but bad breath still exists, it is recommended that the patient visit the gastroenterology department to see if there is a problem of gastrointestinal diseases. If it is caused by gastrointestinal diseases, it is recommended that the patient carry out the corresponding treatment, pay attention to diet in daily life, maintain good eating habits, avoid spicy and stimulating diet, maintain good oral hygiene, bad breath can also slowly subside.