In terms of preventing tooth decay in babies, you can do the following: 1. Feed your baby a few mouthfuls of plain water after each drink of milk or supplementary food to clean the milk or food residue left on the tooth surface in the mouth, gradually regular feeding after 3 months of age, gradually reduce or even stop the habit of taking a bottle to bed, the habit of sleeping with a bottle or nipple, the habit of feeding at night should be gradually stopped, generally 1 year and 3 months of age or older Children over 1 year and 3 months old should gradually stop bottle feeding and drink milk from a cup or bowl instead. As the age increases and teeth erupt, vegetables or fruits containing fiber should be chewed, which can increase the self-cleaning effect of tooth surface and exercise chewing ability, which is beneficial to jaw bone development; 2, after the baby grows out the first tooth, it should start to brush teeth, once in the morning and once in the evening, parents can learn the circular arc brushing method to brush teeth for baby; 3, it can receive professional anti-caries measures, after the baby grows out teeth, an oral examination should be conducted once every six months to check the caries risk. The baby should undergo caries risk assessment, check whether there is enamel underdevelopment, tooth demineralization, assess tooth caries susceptibility, whether there are high-risk factors, discover early caries as early as possible, and control early. 3-8 years old children can be coated with local fluoride once every six months, and babies with high risk of caries need to be coated with fluoride once every three months. 3 years old onwards, the baby can do sulcus closure according to the situation. Parents should also receive professional guidance to learn how to do proper oral care and brushing for their babies, and improve the skills of controlling oral hygiene for their babies through regular review.