After the age of 3, the baby can basically take care of itself, the oral care work in this period is mainly responsible for the baby, the mother is responsible for correction, supervision and inspection; the dentist is responsible for regular fluoride application and fossa closure. Specific care work is as follows: 1, rinse mouth after meals, remove food residues. 2, using children’s professional toothbrush and fluoride toothpaste, every morning and evening the baby insist on brushing their own teeth for 3 minutes, the mother is responsible for correcting the wrong way of brushing, supervising the brushing time and checking the effect of brushing. The specific practice of checking the effect of brushing: 1, after the child brushes his teeth, let the child lie on the sofa or bed, holding the child’s head, with dry gauze or dry cotton, wipe the teeth, after wiping, if the gauze or cotton is still white, it means that the brush is clean, if the gauze or cotton has a layer of yellow, greasy things on top, it is definitely not clean. 2.Every night before or after meals, the mother will use dental floss to help clean the gap between the baby’s teeth. 3, from the age of 3 years old to apply fluoride, every six months to the dental hospital or clinic to do regular return visits until 14 years old. 4, 3-4 years old milk molars, 6-7 years old first permanent molars, 12-13 years old bicuspid and second permanent molars, do the sulcus closure, especially the first permanent molars must be done.