Bitter and smelly mouth in the morning is mostly caused by physical problems, which can be divided into several aspects, such as gastrointestinal problems, pharyngitis problems, tooth decay, and not cleaning the mouth at night, which will also partially affect the taste of the mouth.

There are many and complicated reasons for bad breath, which are mainly divided into two types, one is pathological and the other is non-pathological. Non-pathological halitosis is mainly caused by people not eating, drinking or drinking water after a night's sleep. For example, the night before, you ate foods with strong breath, such as leeks, onions and shallots. This kind of bad breath is relatively simple. You can clean it thoroughly after eating. You can brush yourself with mouthwash, tooth washer or toothbrush. You don't have to be too serious. The problem of bad breath caused by pathology is more complicated. Some of them are even caused by other diseases of the body. Only by removing physical diseases can we fundamentally solve the problem of bad breath. There is also a pathological halitosis in the mouth, which is oral halitosis. Most people do.

Because of the bad breath caused by gastrointestinal problems, it is necessary to develop good eating habits, keep regular meals, and regularly quantify three meals a day. Because of irregular diet, it is easy to cause gastrointestinal dysfunction. Eat less and eat more, and the diet needs to be based on positive food. Some items that are too sour and spicy should be eaten less, not more. We should also ban smoking and alcohol, and eat less cold drinks and ice cream, because these foods are very harmful to the stomach. Don't eat greasy food.

To sum up, I suggest you go to the hospital to check what the cause is, and then carry out effective radical cure and prevention according to the cause. It is recommended to brush your teeth after dinner at night to avoid food residue affecting your teeth health.