One year old baby’s teeth falling out piece by piece may be related to enamel underdevelopment, caries and so on. Baby tooth enamel in the development process, will be affected by systemic diseases, systemic malnutrition, genetic factors. This leads to abnormalities in the structure of tooth enamel, resulting in enamel hypoplasia, enamel defects, and the phenomenon of a piece of tooth falling out. Some babies are prone to caries due to their own poor dental development and their fondness for sugar or acidic substances. There is demineralization of the teeth, resulting in the loss of a piece of teeth. More than a year old baby teeth fall out in pieces, can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions to carry out relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or treatment.