The causes of dental erosion in two-year-old babies mainly include congenital factors, poor dietary habits and failure to establish good oral care habits. 1. Congenital factors: during embryonic development, if the pregnant woman lacks vitamins or nutrients, it will lead to poor development of the dentin; and then after birth, there will be tooth defects and easy to corrode the symptoms. 2. Bad dietary habits: babies eat night milk, like to eat sweets or drinks will lead to a large number of bacteria in the oral cavity, the secretion of acidic substances will lead to dental corrosion and caries. 3. Oral care: babies need to develop good oral care habits, that is, morning and evening to brush their teeth, and rinse their mouths in a timely manner after eating, and regularly check their teeth in order to find the problem in a timely manner. Baby teeth corrosion recommended timely medical diagnosis and symptomatic treatment, to avoid delaying the condition.