If a child loses a tooth, the following treatment can be taken: 1. If the crown is broken and only the root remains, the pulp tissue can be removed, the root canal canal can be filled with calcium hydroxide, and the root canal opening can be closed to wait for the eruption of permanent teeth. 3. If the baby teeth are lost prematurely and the permanent teeth have not yet grown, a gap retainer should be worn to maintain the gap between the teeth to prevent the permanent teeth from erupting with difficulty or misshapen jaw after the teeth on both sides have moved.