Milk teeth are the first growths of a child and are not replaced. Milk teeth usually erupt around six months after birth and fully erupt around two and a half years of age, establishing a stable occlusal relationship. Milk teeth usually begin to fall out around the age of six to seven, and after they fall out, permanent teeth will grow in. There are 20 milk teeth, five in each quadrant: the incisors, lateral incisors, cusps, and two molars. Milk teeth are smaller, whiter in color, have larger crowns and roots, larger pulp cavities, and thinner hard tissues. Although milk teeth do not last a lifetime, it is important to exercise chewing and establish a stable bite during early childhood. In addition, milk teeth are the first set of teeth that grow after birth, so they should be carefully protected, and if they develop caries, they should be treated in a timely manner according to the doctor’s instructions.