This chapter summarizes the current knowledge of how and why external apical root resorption (EARR) occurs and how the clinical orthodontist manages root resorption at the initial, mid- and post-treatment stages, by answering ten commonly asked questions: 1. Which patients are at the greatest risk? 2. Can I move teeth with really short roots? 3. What happens if I move a root that is still growing? 4. What happens if I move a tooth with endo? 5. How do I manage patients at risk? 6. What do I do if I see EARR at progress? 7. What do I do if I see EARR at the end? 8. What is invasive cervical root resorption? 9. Can EARR be detected without radiographs? 10. What happens to resorbed roots long term?
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