Many babies have the habit of drinking milk before going to bed. Long sleep time at night is a good opportunity for bacteria to breed and cause tooth decay, so after baby drinks milk, make sure baby brush teeth and clean mouth before going to bed, otherwise it will easily cause “bottle caries”. Early infantile caries Bottle caries is one of the quite serious “early infantile caries”, and it does not happen only when you use the bottle. This kind of early childhood caries usually occurs firstly in the front incisors of the upper jaw, there will be cavities of caries, and then the first molars also have caries situation. Decalcification is the sign The white spots will appear on the tooth surface of the upper jaw front incisors in contact with lips first, which is decalcification. Then, the white spots will become cavities, and the cavities will be stained brown-black because of the food pigment. Severe crown fracture If it continues to deteriorate, crown fracture may occur. Baby’s tooth decay usually proceeds quite fast, and some parents even think that baby’s tooth is so short, in fact, it is because it is decayed before it grows!