The present application discloses a vibration application method including a stage for contacting a contact portion with at least one tooth, and a stage for causing the contact portion to vibrate so as to impart displacement of 0.04 μm or more to the contact portion. The difference between the maximum value and minimum value of a vibrational load during the time the contact portion is vibrating may be 3 gf to 10 gf. The stage for contacting the contact portion with the at least one tooth may include a stage for contacting the contact portion with an orthodontic appliance attached to the at least one tooth.
