Invisible braces may need to be nailed, but for mild crowding micro-correction, generally do not need to be nailed, so it needs to be determined according to the degree of malocclusion. 1. Mild crowding: mild crowding of the teeth in the whole mouth or mild twisting and tilting of some of the teeth, etc. If you choose invisible braces for orthodontic treatment, you generally do not need to hit the bone nails, and you can align your teeth by making piece cuts as well as bonding attachments. 2. Heavy crowding, bony misalignment: For deep overlay, deep cover, bony misalignment, odontogenic overcrowding and other problems, when choosing invisible braces for correction, generally need to play the implant impedance nails on the buccal side of maxillary and mandibular posterior teeth to increase the traction of posterior teeth, so as to make the front teeth inwardly closed, and to improve the phenomenon of protrusion of the front teeth, etc.. The purpose of invisible braces to play the implant bone nail is to increase the traction of orthodontic strength, so that the teeth move to the ideal position, and to achieve the purpose of the front teeth inward, it is recommended to go to the hospital stomatology to find a doctor for the situation of the individual teeth to determine the need to play the bone nail.