When should I start brushing my teeth? When is brushing necessary? You should start brushing your baby’s teeth as soon as the first milk teeth erupt. Remember to brush your baby’s teeth after every milk and complementary food. It is especially important to brush your baby’s teeth at night after eating milk. Many children have the habit of eating and sleeping at night while holding a bottle of milk. Eating milk before bedtime is especially bad for teeth, especially for children who eat formula milk, which is very sweet and is bound to breed a lot of bacteria if teeth soak in milk overnight. Doctors recommend not to breastfeed at night, and if the child must eat, remember to give the child some plain water after feeding, or brush the child’s teeth with a gauze or fingertips. If parents belong to caries-susceptible group, they should pay extra attention to the oral health of their children. The so-called caries-susceptible people are those who are prone to dental caries. If parents are caries-susceptible people, children are more likely to get caries because the Streptococcus pyogenes in parents’ mouth will spread to children. For example, if the father of the child has caries, in order to help the child taste the milk hot or not, he takes a sip himself before giving it to the child, or even chews the food before giving it to the child. All these intimate actions, kisses, etc. may spread cariogenic bacteria to the child. In addition to that, get your dental disease cured before you get pregnant so as not to spread it to your child when you feed your child during breastfeeding.