Some people eat more spicy, greasy and heavy food, and the enzymes in the mouth decompose it into sugar, so the sweetness of the mouth will be relieved by adjusting the diet, reasonable and balanced nutrition, such as less oil, less salt, less sugar and fresh fruits and vegetables, and moderate meat, eggs and milk. In addition, we should be alert to whether the increase of sugar in the body’s blood causes the sweetness of the mouth, let the doctor check fasting blood sugar, two hours after meals blood sugar, and even glycated hemoglobin, to help detect whether the body in the increase of blood sugar, causing the sweetness of the mouth. If the sweetness in the mouth lasts for a long time, on the one hand, you should check whether your lifestyle is healthy, and on the other hand, you should go to the hospital for a detailed examination by a doctor.