Drinking some milk at night appropriately generally does not cause significant harm to the body, but if you often drink too much milk at night, it may cause harm to the body, such as may lead to gastric discomfort, and there may be dental caries, fat and so on. 1. Gastrointestinal discomfort: milk is a high-protein drink, if you drink too much milk at night, it is not easy to digest, and it is easy to increase the burden on the gastrointestinal tract, which leads to gastrointestinal discomfort and bloating. 2. Dental caries: If you drink milk at night after not timely cleaning of the mouth, there is milk residue in the mouth, over time may lead to dental caries. 3. body fat: night if you drink too much milk, the body intake of too much energy, it is easy to lead to fat accumulation, thus making the body fat. In order to consider the health of the body, it is recommended to drink milk at night to control the amount, do not drink too much. The people who are allergic to milk are not suitable to drink milk.