1. Take your child to a pediatric dentist when he or she is 1 year old or teething. 2. When the last two molars come in (2 1/2 to 3 years old), help your child floss his or her teeth. 3. Don’t wait until your child is 7-9 years old or can tie his or her own shoes before letting him or her brush his or her own teeth. 4. Make sure to control your child’s finger eating habit when he/she is about 5 years old. This is a critical stage in the formation of teeth, and finger-sucking can easily lead to malformed teeth. 5, children try to drink plain water. Do not pour juice and other drinks into children’s water glasses. 6.Reduce the sweet snacks between meals. Sweet food is the main culprit of tooth decay. Reducing the number of times teeth are exposed to sugary food is more critical to dental care than how much sugar is eaten. 7, limit children to eat raisins and other sticky food. Experts said that raisins are rich in nutrition, children should drink water or rinse their mouth after eating such food to prevent food residue on teeth. 8.Parents should keep oral hygiene. It is found that the bacteria that cause tooth decay can be spread from adults to children. Antibacterial mouthwash can effectively reduce the number of bacteria that cause tooth decay. 9.Don’t use the same spoon with children, bottles and spoons should be dedicated to each other to prevent mixing tableware between adults and children, or children and children. 10.Older children can chew sugar-free gum. Chewing gum helps to increase saliva secretion and neutralize dental acidity. Several studies found that chewing sugar-free gum for 20 minutes after meal can prevent tooth decay.