What is the primary function of a bite stick in orthodontics?

The primary function of a bite stick in orthodontics is to help seat molar bands. This tool is specifically designed to assist in achieving the proper placement of the bands over the molars during the fitting process. By applying even pressure, orthodontists can ensure that the bands are securely positioned on the teeth, which is crucial for effective treatment. The use of a bite stick not only facilitates accurate band placement but also minimizes discomfort and potential injury to the patient's oral tissues.

Other tools mentioned in the options, such as wire cutters, ligature tie tools, and arch wire removers, serve different, specific orthodontic functions. While they are essential in their own right, they do not relate directly to the primary role of seating molar bands, which is the job of the bite stick.