Cavities in baby teeth can heal when they are replaced by permanent teeth, but cavities in baby teeth still need to be treated. Because the decay can deepen, leading to premature loss of the tooth, which can affect the development of the permanent teeth. Severe cavities can lead to abnormal development of the permanent teeth, and even after the child's teeth are replaced, the new teeth may not be in good condition. For example, if the root of a baby tooth becomes inflamed and the inflammation is not treated and cleared, the alveolar bone around the tooth root can also become inflamed. Below the alveolar bone is the germ of the new tooth, and prolonged inflammatory stimulation can affect the germ of the permanent tooth. Additionally, premature loss of baby teeth can lead to the loss of adjacency between teeth, which can affect the growth and development of permanent teeth. Therefore, it is important to detect and treat cavities in baby teeth early, and ideally perform pit and fissure sealants before cavities form.