Bad breath occurs in almost everyone, and some people develop low self-esteem and social phobia as a result. Bad breath is a reflection of certain diseases in the body, gastrointestinal diseases, nasopharyngeal diseases, respiratory diseases, etc. may be associated with bad breath. People who smoke, drink alcohol, coffee and often eat spicy and stimulating foods such as onions, garlic, leeks, or who are addicted to smelly foods such as stinky tofu are also prone to halitosis. Many of the patients with GERD that we come in contact with in the clinic have bad breath. The reason for bad breath is that their gastrointestinal tract is weak, food is not easily digested and emptied, and the food stays in the stomach for a long time, food decay and volatile odor, plus they easily reflux, the smell is exhaled through the mouth, and bad breath is formed. This part of the patient is mostly accompanied by symptoms of GERD, such as acidity, heartburn, bloating, belching, etc. Once you suffer from bad breath, you should not take medicine indiscriminately. For oral, digestive, respiratory and other diseases caused by bad breath, to find the appropriate cause of the right medicine. Long-term drinkers and smokers should try to control. When eating onions and garlic and other spicy foods, use mint mouthwash, drink more water. Chewing some tea, chewing gum to stimulate saliva secretion is also very helpful to eliminate oral odor. For bad breath caused by GERD, it is most crucial to control GERD. Life should try not to eat high-fat food, chocolate, coffee, strong tea, avoid acid, sweet, stimulating food, and quit smoking, alcohol; to eat less and more, chew slowly, do not eat 2 to 3 hours before bedtime. Elevate the head of the bed 30 cm during sleep instead of just padding the pillow. Reduce factors that lead to increased abdominal pressure, such as not tightening the girdle, avoiding constipation and controlling weight.