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Their advantage over the helical gears is that the side-thrust of one half is balanced by that of the other half. This means that herringbone gears can be used in torque gearboxes without requiring a substantial thrust bearing.
Some orthodontists will have hooks on every posterior bracket which makes it a little more difficult to keep clean. Most orthodontists have hooks on the cuspid and molar brackets only. These hooks can be used for various attachments like springs and rubber bands to help move the teeth. The majority of the time, these hooks are used for elastic rubber bands. Rubber bands can be used in many different configurations. Normally, they are used inter arch which can be from top to bottom, side to side or front to back. A typical example is a patient that has an excessive overjet (overbite).