A foot straightening trainer apparatus for helping to correctly align or straighten pigeon-toed and penguin-toed feet of users. Each of the transportation rollers 22 is generally hollow cylindrical member formed with a plurality of slit nozzles 24 in the circumference. The variety of products are firstly assembled on the cell conveyers respectively and then conveyed to the main conveyer to be finally assembled. The magnetic core forms a continuous magnetic path to direct the magnetic flux generated by the excitation coil to the fixing member. The ability to calculate distances and display occlusal contacts in a proposed set-up assists the user in planning treatment for the patient.