Baby teething can be painful. During the gradual movement of the embryo of milk teeth towards the gums, it will stimulate the surrounding tissues to produce pain, inducing the baby to form the phenomenon of gnawing fingers or toys. The newly erupted crown of the tooth is easy to adhere to the food debris and soft dirt around, resulting in a large number of bacterial reproduction, triggering local mucous membrane congestion, swelling and pain. Milk molar teeth in the eruption, due to the crown area is larger, the eruption time is longer, the first exposed tooth tip can form a gingival pocket with the mucosa, embedded a large number of food debris, causing eruptive gingivitis. Some babies may have elevated body temperature, emotional irritability or crying. The pain of baby teething will not last too long, and will be gradually alleviated when the crown of the tooth is fully exposed.