The difference between thrush and mouth ulcers: Thrush is a fungal infection, mainly in infants and young children, and develops as snowflake-like patches in the mouth, with a large area and a white film on the surface. In addition, thrush has no sensation and does not affect the child’s ability to eat, etc. Incomplete sterilization of bottle teats, children’s love of biting fingers, and unclean mother’s nipples during breastfeeding are all sources of infection. Mouth ulcers are mostly seen as viral infections that can develop at any age, mainly as scattered or single wounds. Mouth ulcers are painful and the child will experience discomfort when eating, etc. Because the weak alkaline environment is not conducive to the growth of mycobacteria, such as thrush can be 2% to 5% of the soda to clean the mouth; other methods such as 1% glycerin or traditional Chinese medicine ice borax coated oral cavity are effective. Do not eat milk or drink water when applying the medicine, it is best to apply the medicine after eating milk to avoid washing away the medicine in the mouth. It is recommended to consult a professional doctor before using any medication.