Every day in the clinic, we encounter many parents who come for checkups, and when they are told that their children’s teeth have cavities that need to be treated, they all have a surprised look on their faces: “Won’t these teeth be replaced? Why does it still need to be filled?” I have to say, milk teeth in the child’s growth and development plays an important role in the permanent teeth have not yet erupted, it is an important organ for children to chew food, when the permanent milk teeth replacement, it plays an important role in guiding the formation of permanent teeth, milk teeth once caries, the child’s growth and development in the future and the psychological have an important impact! Tooth decay will cause defects in the dentition, causing food blockage, and if it develops into pulp (nerve) inflammation, it will cause severe pain, which will seriously impede the child’s eating and sleeping, and affect the child’s intake of sufficient nutrients from food, thus affecting the child’s growth and development. If it continues to develop deeper causing inflammation of the periapical tissues, it will lead to gum abscess and swelling of the oral and maxillofacial region, and in severe cases, cellulitis of the maxillofacial tissues. More importantly, the embryo of the permanent teeth is located under the roots of the milk teeth, once the infection is severe, the embryo of the permanent teeth will be affected, which will lead to its abnormal shape or development. When milk teeth are severely decayed and lost prematurely, the adjacent teeth will shift to the gap, which will narrow the gap and cause the permanent teeth behind to not have enough space to erupt, resulting in misaligned eruption or failure to erupt, leading to crowding of the teeth. The development of the jaw and face in childhood needs the stimulation of chewing function. When the caries of the milk teeth affects the child’s chewing, the jawbone will be underdeveloped due to the loss of normal physiological stimulation, which will result in the misalignment of the subsequent permanent teeth. When one side of the teeth is decayed, the child often chews only on the other side due to pain and discomfort, and prolonged unilateral chewing can lead to asymmetrical facial development. Caries in childhood can also cause chronic foci of infection, associated with low-grade fever, rheumatoid arthritis, nephritis, etc. Caries in the anterior teeth also affects children’s pronunciation and mental health. In conclusion, baby teeth play a vital role in children’s growth and development, parents should pay enough attention to early prevention, early detection, early treatment! Don’t delay your child because of your negligence!