The causes of sweet mouth after meals are mainly physiological factors and pathological factors. It is recommended that people should be examined in regular hospitals and treated under the guidance of doctors after the causes are clarified. 1. Physiological factors: when people eat dinner, salivary amylase will digest the starch in the food and decompose it into glucose, which makes people feel sweet in the mouth. This is a normal physiological phenomenon and does not need to be disturbed. 2. Pathological factors: people due to poor dietary habits, resulting in gastrointestinal dysfunction, thus triggering gastrointestinal diseases, will be due to the breakdown of digestive enzymes abnormal, appear after meals, food digestion is not timely, the mouth feels sweet, this situation should be timely medical treatment. It is recommended that people in their daily life, light diet, eat more vegetables and fruits and other foods rich in vitamins.