The importance of Baby Teeth.
Baby teeth aid in chewing and speaking clearly. They also occupy the tooth buds of the permanent molars, which are developing under the gums.
Decay in a baby tooth, if it starts, doesn't "fix itself" in a short period of time. It can grow more rapidly in children and penetrate deeper into the tooth in a short time.
Hence, dentists look into cavities and do not wait for the tooth to fall out on its own.