Whether or not a child’s tooth can grow back should be determined by whether the tooth is a permanent tooth or a baby tooth. If it is a milk tooth, the tooth bed is intact, it can still grow back, if it is a permanent tooth, the lost tooth cannot grow back. People have two sets of teeth, milk teeth and permanent teeth. Milk teeth begin to erupt 4~10 months after birth, mostly before the age of 3. The first permanent tooth (first permanent molar) erupts at the age of 6. Subsequently, the milk teeth can be replaced one by one by the same permanent teeth, mostly by the age of 12, except for the third permanent molar (wisdom teeth), the rest of the permanent teeth have been replaced. Therefore, if a child loses a milk tooth, a replacement permanent tooth can grow to replace it, but if a permanent tooth is lost, no new tooth can grow. If a tooth falls out, you should go to the hospital to check whether there is any damage to the tooth bed. If there is any damage, it may affect the eruption of the permanent tooth that replaces the milk tooth. It is recommended to actively seek medical attention and consult a medical professional.