After the 10-year-old child’s tooth fell out, a transparent thing grew out may be caused by apical fistula, tooth color change, eruptive cyst. 1. apical fistula: in the early stage of periapical periodontitis there is no fistula, if it is a fistula, it means that the inflammation has penetrated the bone and the gums, which is manifested as a fistula and looks like a transparent blister. 2. Change in tooth color: Damage to tooth enamel is mainly caused by improper protection of the teeth. For example, calcification and erosion of the enamel can cause the teeth to become transparent and look as if they think they are growing a transparent object. 3. Eruption cyst: It is a limited lesion during the eruption of milk teeth and permanent teeth, usually covering the mucosal surface of the teeth to be erupted, manifesting itself as a transparent, elastic round soft tissue mass. If the symptoms of a 10-year-old child’s teeth falling out, a transparent thing grows, persistent and unrelieved, you need to consult a doctor for timely treatment.