White patches on the teeth of one-year-old babies may be related to malnutrition and lack of attention to personal hygiene. 1. malnutrition: baby long time malnutrition, can not get enough calcium and other nutrients from the daily diet, may affect the matrix calcification, appear on the teeth with white plaque situation. 2. Not paying attention to personal hygiene: usually do not pay attention to the baby’s oral hygiene, a large number of food residues remain in the mouth after meals. A large number of bacterial growth will produce acidic substances, leading to demineralization of the teeth, which can also lead to white patches on the teeth. One year old baby teeth with white plaque suggests that parents take their babies to the hospital stomatology department as soon as possible, in order to clarify the cause of the disease, and standardize the treatment.