Infants grinding their teeth with fever are considered to be caused by imperfect development of the nervous system or abnormal muscle regulation. 1. Imperfect development of the nervous system: the development of the nervous system of infants is still imperfect, when there is a fever, the central nervous system is difficult to control the relevant nerves and muscle tissues, which can cause oral muscle function abnormalities, showing the symptoms of teeth grinding. 2. abnormal muscle regulation: when the baby is feverish, the temperature setting point can be shifted upward, so that the temperature of the setting point is more than the baby’s normal body temperature, prompting the baby to feel cold, appearing to be afraid of the cold performance, causing the body’s skeletal muscles to shiver and produce heat, and in the process, it is possible that the oral muscles are involved, resulting in abnormal excitement of the oral muscles, and the emergence of the teeth grinding situation. The baby fever grinding teeth, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.