American Board of Orthodontics (ABO) Practice Exam 2026 - Free Orthodontics Practice Questions and Study Guide

The typical time frame for teeth to begin moving under heavy orthodontic forces is around 7 to 14 days. This timeframe is based on biological processes that occur in the periodontal ligament and surrounding tissues when orthodontic forces are applied. Initially, when the force is applied, there is a period of remodeling in which the bone surrounding the tooth needs to undergo changes to accommodate the movement.

During the first few days after the application of forces, there may not be significant tooth movement as the body reacts to the pressure. It can take about a week or two for the osteoclasts and osteoblasts to begin resorbing and depositing bone respectively, allowing for noticeable movement of the teeth. This biological response underscores the importance of patience in orthodontic treatment, as rapid changes in position can often lead to undesired effects or complications. Therefore, understanding the biological timelines involved helps clinicians have realistic expectations for treatment outcomes.