An experienced orthodontist will pay attention to the size, direction and timing of the force applied by the appliance to ensure that the patient’s teeth move within the physiological tolerance range during the orthodontic treatment. As long as the design is correct and the operation is done properly, no matter whether it is extraction or non-extraction orthodontic treatment, after a period of consolidation after the treatment, the patient’s teeth will be stabilized and will not leave any after-effects.