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The success of clear aligner treatment relies on rational treatment planning, favorable patients' compliance and high-quality clinical dental monitoring. High-quality clinical dental monitoring involves not only evaluation of real-time tooth position and treatment-designed tooth position, but also the assessment of the root-alveolar bone relationship. However, fluent imaging tests with ionizing radiation are not realistic in clinical practice. Regarding the rapid advances in digital techniques, biomechanism based method, image processing algorithm-based method and multimodal data fusion-based method all exhibit great potential in monitoring tooth movement. This paper introduced the progress and clinical application in those methods for clinicians' reference.