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A 4-year-old's primary incisor is avulsed. Why must it NOT be replanted? Replanting a primary tooth risks damaging the developing permanent successor beneath (and ankylosis); the protocol is leave it out, manage the socket, and monitor the permanent tooth's eruption. Students learn the primary-permanent split: permanent avulsion - replant racing the clock; primary avulsion - protect the successor - because the developing tooth underneath outranks the lost one.